Is dolomite a sedimentary rock

Dolomite is the name of a sedimentary carbonate rock and a mineral, both composed of calcium magnesium carbonate Ca Mg ( C O 3) 2. As a mineral, it is found in crystals. Dolomite rock (or 'dolostone') is mostly made of the mineral dolomite. Limestone that is partially replaced by dolomite is referred to as dolomitic limestone.

Sedimentary Rocks: Calcite is a major component of various sedimentary rocks, most notably limestone and its metamorphic counterpart, marble. Limestone formations can be massive and extensive, representing ancient marine environments where calcite-rich shells and skeletons accumulated. ... Dolomite: Calcite and dolomite often …Bone to Stone: Building Fossils - Building fossils starts after the organic parts of an animal break down, leaving the bones behind. Learn more about the process of building fossils. Advertisement Most of the dinosaur skeletons you see in m...The large limestone rock formations, previously called dolomite, should have a new name, dolostone, or magnesian limestone. Calcium carbonate limestone is just limestone. Dolostone. Dolostone is a major sedimentary rock formation in the earth’s crust and joins with other sedimentary formations like shale, sandstone, and limestone.Dolostone is a common sedimentary rock which can be found in massive beds several hundred feet thick. Disputes have arisen as to how these dolomite beds form as at present time, dolomite does not form on the surface of the Earth, yet massive layers can be found in ancient rocks. Dolostone Forms Dundas, OntarioDolomite. The mineral dolomite is the main component of the sedimentary rock that is also called dolomite. It is similar to the mineral calcite but contains magnesium as well …When sedimentary rock contains a high concentration of dolomite – calcium magnesium carbonate CaMg(CO3)2 – we can call it dolomite, dolomite rock, or dolostone. The mineral dolomite is quite rare in …Sedimentary rocks are grouped into three classes: clastic, chemical, and biological. Clastic rocks include sandstone, shale, mudstone, siltstone, and conglomerate. Chemical rocks include limestone, dolostone (dolomite), and evaporates such as gypsum and salt. Biologic rocks include coal and chert.

In sedimentary rock containing calcite and magnesium (Mg), diagenesis may transform the two minerals into dolomite (CaMg(CO 3) 2). Diagenesis may also reduce the pore space, or open volume, between sedimentary rock grains.Dolomite rock. 11 May 2019|Dolomite Powder, Mineral. Dolomite (also known as dolostone, dolomite rock or dolomitic rock) is a sedimentary carbonate rock that ...Sep 26, 2020 · In this article we will list out several known examples of sedimentary rocks as well as some that are not so well known. We will go into some detail into the three types of sedimentary rocks as well so as to give you a feel for the sedimentary rock types. Some examples of sedimentary rocks: Coal. Limestone. Dolomite. Dolomite (CaMg(CO 3) 2) is another carbonate mineral, but dolomite is also the name for a rock composed of the mineral dolomite (although some geologists use the term dolostone to avoid confusion). Dolomite rock is quite common (there’s a whole Italian mountain range named after it), which is surprising since marine organisms don’t make ...Limestone is an occurring type of sedimentary carbonate rock found on Earth’s surface. It is formed when crystals of calcium carbonate precipitate out of water containing dissolved calcium. Limestone is composed of minerals such as calcite and aragonite. Limestone consists of 80 percent calcite and Dolomite with more than 50% calcium carbonate. lead to two distinct populations of sedimentary dolomite: (1) dolomitic limestones originate in diagenetically ... AGE, LOCALITY, LITHOLOGY, ROCK COMPOSITION, AND ...

Sedimentary rocks are very common in Missouri, as many cycles of ocean rise and fall deposited sediment across the basement rocks, most often leading to limestone formation. ... Carbonate rocks, specifically limestone and dolomite, formed from calcite and dolomite minerals and represents a large portion of the Cambrian rocks …Sedimentary Rocks. The Marcellus Shale is a sedimentary rock thousands of feet beneath the earth's surface stretching from upstate New York to West Virginia. ... Clastic rocks include sandstone, shale, mudstone, siltstone, and conglomerate. Chemical rocks include limestone, dolostone (dolomite), and evaporates such as gypsum and salt.Nov 28, 2022 · The rock-forming process is known as dolomitization. Dolomite is a common rock, but the mineral dolomite is rarely found in sedimentary settings. Hence, most dolomites form when lime muds or mudstones are altered by post-depositional chemical change. These rocks also originate in the same sedimentary settings from where limestone comes. Fossils are primarily found in sedimentary rocks because these rocks form at low temperatures and pressures. Igneous rocks form at temperatures and pressures that are high enough to destroy any organic remains.Mar 16, 2015 · Dolomite is a sedimentary rock composed primarily of calcium magnesium carbonate. The word dolomite is also referred to dolomite mineral so sometimes being confused between rock and mineral. Limestone is composed of calcium carbonate and dolomite is composed of calcium magnesium carbonate so it is thought to be originated by the post ... Jul 7, 2022 · Dolomite rocks are important oil reservoir rocks because average dolomite has usually higher porosity than limestone. …. Dolomite rock is a very common sedimentary rock, especially older carbonate rocks (formed before the Mesozoic) tend to be dolomites whereas younger carbonates are predominantly various limestones.

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Sedimentary rocks are grouped into three classes: clastic, chemical, and biological. Clastic rocks include sandstone, shale, mudstone, siltstone, and conglomerate. Chemical rocks include limestone, dolostone (dolomite), and evaporates such as gypsum and salt. Biologic rocks include coal and chert.Dolomite may be found in limestone, called dolomitic limestone, as well as dolomite-containing rock, known as dolostone. Dolomite falls at 3.5 to 4 on the Mohs hardness scale, which rates how ...Dolomite (CaMg(CO 3) 2) is another carbonate mineral, but dolomite is also the name for a rock composed of the mineral dolomite (although some geologists use the term dolostone to avoid confusion). Dolomite rock is quite common (there’s a whole Italian mountain range named after it), which is surprising since marine organisms don’t make ...Sedimentary rocks are formed on or near the Earth’s surface, in contrast to metamorphic and igneous rocks, which are formed deep within the Earth. The most important geological processes that …Composition of Sedimentary Rocks Types of Sedimentary Rocks. There are three main types of sedimentary rocks that differ based on their composition and process of formation. 1. ... Dolomite: C: Grey-buff, H = 3.5, reacts mildly with dilute HCl when powdered: Gypsum: C: White-grey, H = 1, associated with carbonates:

This email takes a break next week, to return on July 5. If you are also hiking around the Dolomites, give me a wave! This email takes a break next week, to return on July 5. If you are also hiking around the Dolomites, give me a wave! Hell...Table of Contents. Sedimentary rock - Limestone Formation, Calcium Carbonate, Fossils: Limestones originate mainly through the lithification of loose carbonate sediments. Modern carbonate sediments are generated in a variety of environments: continental, marine, and transitional, but most are marine. The present-day Bahama banks is the best ...Sedimentary rocks are one of the three great rock classes (along with igneous and metamorphic rocks). Learn about how they form and their characteristics. Menu. ... The most important types of diagenesis involve the formation of dolomite mineralization in limestones, the formation of petroleum and of higher grades of coal, ...Dolostone is a common sedimentary rock which can be found in massive beds several hundred feet thick. Disputes have arisen as to how these dolomite beds form as at present time, dolomite does not form on the surface of the Earth, yet massive layers can be found in ancient rocks. Dolostone Forms Dundas, OntarioClastic Sedimentary Rocks. How Clastic Sedimentary Rocks are Formed: Pre‑existing rock undergoes chemical and mechanical weathering by roots, acid rainwater, gravity, wind, and water. The broken particles are carried through water or air until they settle out in a lower area when the current wasn’t fast enough to carry the particles.Dolomites crystal size distributions are lognormal to normal coarse skewed regardless of age or mean size (Gregg et al., 1992; Sibley et al., 1993).Similar crystal size distributions are found in other diagenetic minerals, as well as minerals in igneous and metamorphic rocks (Eberl et al., 1998).Nonplanar dolomite tends to be coarser crystalline and more …Describe how water is an integral part of all sedimentary rock formation. Explain how chemical and mechanical weathering turn bedrock into sediment. ... Dolomite only reacts to hydrochloric acid when ground into a powder, which can be done by scratching the rock surface (see chapter 3).Fossils are primarily found in sedimentary rocks because these rocks form at low temperatures and pressures. Igneous rocks form at temperatures and pressures that are high enough to destroy any organic remains.Dolostone is a sedimentary rock composed of dolomite, which is made up of calcium magnesium carbonate, and is similar to limestone. Dolostone underlies nearly all of Illinois, with the exception ...Sedimentary rock - Evaporites, Deposits, Minerals: Evaporites are layered crystalline sedimentary rocks that form from brines generated in areas where the amount of water lost by evaporation exceeds the total amount of water from rainfall and influx via rivers and streams. The mineralogy of evaporite rocks is complex, with almost 100 varieties …Dolomite forms in hydrothermal veins or as a pore-filling mineral in carbonate rocks, and more rarely as an accessory component in igneous pegmatites or altered mafic igneous rocks. By far though, most dolomite occurs in altered sedimentary marine rocks called dolostones or in marbles formed from the metamorphism of dolostone.Dolostone is a sedimentary rock composed of dolomite, which is made up of calcium magnesium carbonate, and is similar to limestone. Dolostone underlies nearly all of Illinois, with the exception ...

Jan 28, 2023 · Sedimentary carbonate rocks consist predominantly of carbonate minerals (as the name implies). There are two main types of carbonate rocks, dolomites and limestones. The first is modally dominated by dolomite (CaMg(CO3)2), the second by calcite (CaCO3) and there is a...

Detrital Sedimentary Rocks. Detrital sedimentary rocks form from detritus, the rock and mineral fragments that are transported by gravity, water, ice, or wind. Detrital sediments are classified by grain size. Detritus is classified by its grain size. Grains larger than 2 millimeters are called gravel . Grains between 1/16 mm and 2 mm are called ...Sedimentary rocks are made of lithified (i.e. converted to rock) sediments. Lithification is a conversion of loose sediments into solid rocks. Sediments are grains (or clasts) of rocks, minerals, or mineraloids deposited on the surface of the earth. Reflect on the rock cycle for an indication of the relationships between the rocks that erode to ... A dolomite formed at only 40°C could be hydrothermal, if the surrounding rocks were significantly colder than that at the time of dolomite formation. If a mineral was formed at or near the same temperature as the surrounding rocks (within 5–10°C), it should be called “ geothermal ” ( Figure D35, center ), whatever the geothermal gradient.Limestone is an occurring type of sedimentary carbonate rock found on Earth’s surface. It is formed when crystals of calcium carbonate precipitate out of water containing dissolved calcium. Limestone is composed of minerals such as calcite and aragonite. Limestone consists of 80 percent calcite and Dolomite with more than 50% calcium carbonate. Seismic S-waves were used for the assessment of the ease of surface excavation of sedimentary rock masses. Extensive field and laboratory studies were performed on eight sedimentary rock sites (Limestone, Conglomerate, Flysch, Dolomite, Breccia) with a variety of weathering and strength conditions (23 data) in the area of …28. 10. 2021. ... Dolomite is a sedimentary carbonate rock or type of limestone in which timely use right now in Manila Bay for Beach nourishment and ...Dolomite rock is a white or lightly tinted sedimentary rock consisting largely of the calcium-magnesium carbonate mineral dolomite. ThoughtCo / Andrew Alden Dolomite rock, also sometimes called dolostone, is usually a former limestone in which the mineral calcite is altered to dolomite.Table of Contents Sedimentary rock - Limestones, Dolomites, Carbonates: Limestones and dolostones (dolomites) make up the bulk of the nonterrigenous sedimentary rocks. Limestones are for the most part primary carbonate rocks. They consist of 50 percent or more calcite and aragonite (both CaCO3).Dolomite may be found in limestone, called dolomitic limestone, as well as dolomite-containing rock, known as dolostone. Dolomite falls at 3.5 to 4 on the Mohs hardness scale, which rates how ...Sedimentary Rocks. Sedimentary rocks (layered rocks) are made by the deposition of particles carried in air or water and by the precipitation of chemicals dissolved in water. These particles and chemicals come from the weathering (breaking apart in place) and erosion (carrying away and breaking apart while moving) of rocks on the Earth's surface.

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Dolomite may be found in limestone, called dolomitic limestone, as well as dolomite-containing rock, known as dolostone. Dolomite falls at 3.5 to 4 on the Mohs hardness scale, which rates how ...Sedimentary rocks can be organized into two categories. The first is detrital rock, which comes from the erosion and accumulation of rock fragments, sediment, or other materials—categorized in total as detritus, or debris. The other is chemical rock, produced from the dissolution and precipitation of minerals.Sedimentary Rocks. Sedimentary rocks (layered rocks) are made by the deposition of particles carried in air or water and by the precipitation of chemicals dissolved in water. These particles and chemicals come from the weathering (breaking apart in place) and erosion (carrying away and breaking apart while moving) of rocks on the Earth's surface.Dolomite is the name of a sedimentary carbonate rock and a mineral, both composed of calcium magnesium carbonate Ca Mg ( C O 3) 2. As a mineral, it is found in crystals. Dolomite rock (or 'dolostone') is mostly made of the mineral dolomite. Limestone that is partially replaced by dolomite is referred to as dolomitic limestone.Sedimentary rock - Silica, Clastic, Chemical: Those siliceous rocks composed of an exceptionally high amount of crystalline siliceous material, mainly the mineral quartz (especially microcrystalline quartz and fibrous chalcedony) and amorphous opal, are most commonly known as chert. A wide variety of rock names are applied to cherty rocks …25. 10. 2016. ... Dolomite is generally formed from the replacement of the Ca ions with the Mg ions. • In the ancient dolomite the type of its formation can be of ...Jan 28, 2023 · Sedimentary carbonate rocks consist predominantly of carbonate minerals (as the name implies). There are two main types of carbonate rocks, dolomites and limestones. The first is modally dominated by dolomite (CaMg(CO3)2), the second by calcite (CaCO3) and there is a... Conglomerate is a sedimentary rock formed by the lithification of rounded or sub-rounded gravel (grains larger than 2 mm in diameter). Conglomerate is strongly related to sandstone. It is actually a type of sandstone, although it may not be technically correct to say so. Conglomerate is composed of clasts larger than 2 mm (sand is composed of ...Dolomite can be used in asphalt concrete, which is a combination of asphalt binder and aggregate that is typically used in the construction of highways. ... Dolomite, a sedimentary rock composed ...Different geomechanical properties such as elastic modulus/deformation modulus, Poisson’s ratio (υ), uniaxial compressive strength, shear strength properties, tensile strength and point load index are widely used for rock mass characterisation in geological and geotechnical engineering. However, there are no such direct methods by … ….

Dolomite is a very common mineral, and is known for its saddle-shaped curved crystal aggregates. A unique, isolated Dolomite occurrence in Eugui, Spain has provided colorless transparent crystals that resemble the Iceland Spar variety of Calcite.The occurrence of Kolwezi, in the Congo, has produced some fascinating, cobalt-rich specimens that are a …Sedimentary carbonate rocks consist predominantly of carbonate minerals (as the name implies). There are two main types of carbonate rocks, dolomites and limestones. The first is modally dominated by dolomite (CaMg(CO3)2), the second by calcite (CaCO3) and there is a...Dolomite is the name for a mineral composed of calcium magnesium carbonate (CaMg(CO3)2) and for a sedimentary rock that has this mineral as its chief ...In this article we will list out several known examples of sedimentary rocks as well as some that are not so well known. We will go into some detail into the three types of sedimentary rocks as well so as to give you a feel for the sedimentary rock types. Some examples of sedimentary rocks: Coal. Limestone. Dolomite.Why is the mineral dolomite, CaMg (CO 3) 2, abundant in ancient sedimentary rocks but scarce in modern rock-forming environments? What are the …Feb 11, 2022 · Synonyms to luxury and modernism, dolomite, also known as dolostone, is a sedimentary rock composed of the mineral dolomite. It is a common mineral in hydrothermal veins, and it can be found in formations of hundreds or thousands of feet thick. Dolomite is relatively soft and easily cut or cracked, hence its importance in the mining of precious ... Thus, of the eight common igneous minerals, only quartz, K-feldspar, and muscovite are commonly seen in sedimentary rocks. These minerals are joined in sedimentary rocks by clay minerals, calcite, dolomite, …Rocks and minerals can be easily identified once you know what to look for. There are three different types of rocks: Igneous, Metamorphic and Sedimentary. Minerals must meet several requirements, including being naturally occurring and ino...Carbonate sedimentary rocks are composed of minerals based on calcium carbonate (minerals such as calcite, aragonite, or dolomite). Evaporite sedimentary rocks (which we've mentioned already) are ... Is dolomite a sedimentary rock, In this newly identified type of dolomite reservoir, irregular–circular moldic pores and vugs that are uniformly distributed in micritic dolomite matrix formed high-quality reservoir spaces, examples of which are rare worldwide to date. ... According to the rock types and features of sedimentary cycles, the Majiagou Formation is divided into ..., Shale and minor dolomite: Mainly consists of shale interbedded with minor amounts of dolomite. Shale is a fine-grained sedimentary rock formed from the compaction of clay, silt or mud. Additional properties : Thick accumulations of weathered shale on steep slopes can become unstable. Shale tends to slump when overly saturated with water., Updated on January 20, 2019. Sedimentary rocks are the second great rock class. Whereas igneous rocks are born hot, sedimentary rocks are born cool at the Earth's surface, mostly under water. They usually consist of layers or strata; hence they are also called stratified rocks. Depending on what they're made of, sedimentary rocks fall into one ..., Such rocks form vast deposits; in Italy, the Alpine range known as the Dolomites is almost entirely composed of dolomite. However, unlike calcite, dolomite's sedimentary origin is enigmatic. Although it is the most stable carbonate mineral where magnesium is abundant in the marine environment, it is unknown as a primary mineral., Dolomite is both a mineral and a rock. The mineral is a pure form sedimentary rock-forming mineral that can be found all over the world and is quite common ..., Dolostone (Limestone) The principal mineral of limestone is calcite (CaCO3), a form of calcium carbonate. Dolostone is quite similar to limestone, but is composed mostly of the mineral dolomite (CaMg (CO3)2). Both are sedimentary rocks that occur as thin to massive beds of fine- to coarse-grained rock. Their color is typically some shade of ... , Sedimentary Environments: Dolomite can form in a variety of sedimentary environments, including marine, lacustrine (lake), and …, Dolomite is only found in sedimentary rock types and is mostly found in Brazil, Austria, and Italy. Also read: Calcite vs. Quartz: This Is The Difference. Care. Neither of these two should be cleaned using water, as they rate lower than 5 on the Mohs scale. Leaving these two to soak will either dissolve or break them., Limestone is a very common sedimentary rock consisting of calcium carbonate (more than 50%). It is the most common non-siliciclastic (sandstone and shale are common siliciclastic rocks) sedimentary rock.Limestones are rocks that are composed of mostly calcium carbonate (minerals calcite or aragonite). Carbonate rocks where the dominant …, Abstract. Dolomite rock textures can be classified according to crystal size distribution and crystal boundary shape. The classification scheme presented here is largely descriptive but carries genetic implications because size distribution is controlled by both nucleation and growth kinetics, and crystal boundary shape is controlled by growth ..., Dolomite rock is a sedimentary carbonate rock made of more than 50% mineral dolomite. Equal percentages of calcium and magnesium characterize it. Natural dolomite consists of around 44-50% magnesium …, Limestone is a sedimentary rock that allows cave passages to easily form because of its chemical makeup and ability to be dissolved by acidic groundwater. ... Dolomite – looks very similar to limestone and it is made of calcium-magnesium carbonate. ... The rock layers of Mammoth Cave are shown in relation to the cave passages., Sedimentary rock - Evaporites, Deposits, Minerals: Evaporites are layered crystalline sedimentary rocks that form from brines generated in areas where the amount of water lost by evaporation exceeds the total amount of water from rainfall and influx via rivers and streams. The mineralogy of evaporite rocks is complex, with almost 100 varieties …, Except for models invoking formation of dolomite by direct precipitation, a process thought by most geologists to apply to only a small percentage of all dolostones, each model is based on the assumption that the dolomite of …, Dolomite ( / ˈdɒl.əˌmaɪt, ˈdoʊ.lə -/) is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally CaMg (CO3)2. The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite (see Dolomite (rock) ). An alternative name sometimes used for the dolomitic rock type is dolostone., Dolomite is a mineral that is composed of calcium magnesium carbonate (CaMg(CO 3) 2). It is formed from the alteration of limestone or lime mud. Dolomite is commonly found in sedimentary rocks and is often associated with limestone, calcite, and aragonite. Dolomite has a hardness of 3.5-4 on the Mohs scale and a specific gravity of 2.85-2.9., Dolomite may be found in limestone, called dolomitic limestone, as well as dolomite-containing rock, known as dolostone. Dolomite falls at 3.5 to 4 on the Mohs hardness scale, which rates how ..., Dolomite, or dolostone, is a carbonate sedimentary rock made mostly from the mineral dolomite, CaMg (CO3)2. It commonly occurs in association with limestone and shares many of the same properties, but reacts only weakly with acid. Dolomite often has a sugary texture and is typically off-white to gray in color., Dolostone (Limestone) The principal mineral of limestone is calcite (CaCO3), a form of calcium carbonate. Dolostone is quite similar to limestone, but is composed mostly of the mineral dolomite (CaMg (CO3)2). Both are sedimentary rocks that occur as thin to massive beds of fine- to coarse-grained rock. Their color is typically some shade of ..., Also like calcite, the most abundant occurrences are in sedimentary rocks; rocks composed primarily of dolomite are sometimes referred to as dolostone. Such rocks …, Metasedimentary and igneous rocks outcrop over the central portion of the map area (designated as IM on Fig. 40.2 ). Seabed relief on bedrock reaches 40 m in places (over a horizontal distance of ~500 m) but is generally less than 6 m ( Fig. 40.3 ). At regional scale the igneous bedrock exhibits two jointing directions (approximately 40° and ... , Dolomite forms in hydrothermal veins or as a pore-filling mineral in carbonate rocks, and more rarely as an accessory component in igneous pegmatites or altered mafic igneous rocks. By far though, most dolomite occurs in altered sedimentary marine rocks called dolostones or in marbles formed from the metamorphism of dolostone., In this article, we’ll help you decide where to stay in the Dolomites and provide a handful of other useful information for your upcoming trip to Italy’s alpine paradise. Sharing is caring! With its awe-inspiring landscapes, breathtaking vi..., Oolite. Oolite is a type of sedimentary rock, usually limestone , made up of ooids cemented together. An ooid is a small spherical grain that forms when a particle of sand or other nucleus is coated with concentric layers of calcite or other minerals. Ooids most often form in shallow, wave-agitated marine water. Just as oolitic limestones form ..., Dolomite is the name for a mineral composed of calcium magnesium carbonate (CaMg(CO3)2) and for a sedimentary rock that has this mineral as its chief ..., Thus, of the eight common igneous minerals, only quartz, K-feldspar, and muscovite are commonly seen in sedimentary rocks. These minerals are joined in sedimentary rocks by clay minerals, calcite, dolomite, …, Carbonate rocks are sedimentary rocks consisting of carbonate minerals. The most common carbonates in these rocks are the polymorphs of calcium carbonate CaCO 3, calcite and aragonite, and calcium magnesium carbonate CaMg(CO 3) 2, dolomite.A carbonate rock consisting of calcium carbonate is a limestone, whereas one consisting …, Seismic S-waves were used for the assessment of the ease of surface excavation of sedimentary rock masses. Extensive field and laboratory studies were performed on eight sedimentary rock sites (Limestone, Conglomerate, Flysch, Dolomite, Breccia) with a variety of weathering and strength conditions (23 data) in the area of …, Carbonate rocks are a class of sedimentary rocks composed primarily of carbonate minerals. The two major types are limestone, which is composed of calcite or aragonite (different crystal forms of CaCO 3 ), and dolomite rock (also known as dolostone), which is composed of mineral dolomite (CaMg (CO 3) 2 ). They are usually classified based on ... , 7. 4. 2021. ... Dolomite is a common rock-forming material and it is the main component for sedimentary and metamorphic rocks. Dolomite has many industrial ..., Mg and K relative to their source rocks. They are the most abundant sedimentary rocks, composing ~70% of the entire sedimentary rock mass. Carbonates Carbonates (e.g. limestones) are composed primarily of the carbonate minerals calcite, aragonite, and dolomite. Most calcite and aragonite (polymorphs, both with composition , May 18, 2018 · Dolomite is one of the few sedimentary rocks that undergoes a significant mineralogical change after it is deposited. Dolomite rocks are originally deposited as calcite/aragonite-rich limestone, but during a process called diagenesis, the calcite and/or aragonite is transformed into dolomite. , Oolite. Oolite is a type of sedimentary rock, usually limestone , made up of ooids cemented together. An ooid is a small spherical grain that forms when a particle of sand or other nucleus is coated with concentric layers of calcite or other minerals. Ooids most often form in shallow, wave-agitated marine water. Just as oolitic limestones form ...