Dolomite is also known as dolomite calcite and dolomite rock has many uses. It is a sedimentary rock composed primarily of the mineral dolomite. They are found in sedimentary basins around the world. Dolomite rocks are similar to limestone rocks. Dolomite and limestone rocks all share the same color ranges, from white to gray and white to light brown (although other colors such as red, green, and black are possible). Both rocks have approximately the same hardness and both are soluble in dilute hydrochloric acid (HCl). Dolomite, the rock, contains a large proportion of the mineral dolomite. Ideal dolomite has a crystal lattice consisting of alternating layers of calcium and magnesium, separated by layers of carbon dioxide, and is usually represented by the stoichiometric chemical composition of CaMg (CO3) 2, in which calcium and magnesium are present in equal proportions. . Dolomite is thought to form when the calcite in carbonate clay or limestone is modified by magnesium-rich groundwater. Available magnesium facilitates the conversion of calcite into dolomite. This chemical change is known as dolomitization. Dolomitization can completely change limestone into dolomite, or it can partially change the rock to form dolomite limestone. Dolomite is a complex mineral. It is a relatively soft metal that can be easily crushed into a fine powder. The mineral is an anhydrous carbonate mineral composed of calcium (Ca) and magnesium (Mg) double carbons. The two most important components are calcite and dolomite. Limestone frequently contains magnesium carbonate, either in the form of dolomite CaCO3MgCO3 or magnesite (MgCO3) mixed with calcite. These limestone rocks are called "dolomite" or "magnesium". The mineral calcite is usually white or gray, but impurities within or between particles of calcite can make limestone brown, yellow, blue-gray, pink, red, green, gray, or even black. 
Calcite has a specific gravity of 2.710 and a hardness of 3 on the Mohs scale. Easily breaks into small lumps. The texture of limestone is clastic or non-clastic. If it is clastic or bioclastic, broken or whole kernels and/or crust fragments may be seen. If it is unbreakable/chemical, it is crystalline and has no lumps. Grain size is variable and can consist of clumps of all sizes. Limestone contains at least a small percentage of other materials. These can be small particles of quartz, feldspar, clay minerals, pyrite, siderite and other minerals. It may also contain large nodules of flint, pyrite, or siderite. The calcium carbonate content of limestone gives it a property often used in rock identification. It flows on contact with a cold solution of 5% hydrochloric acid (HCl).Dolomite as a mineral has very few uses. However, dolomite has a large number of uses because it is found in deposits large enough for mining. The most common use of dolomite is in the construction industry. They are crushed and sized for use as highway staples, aggregates in concrete and asphalt, railway weight, shredding or packing. It is also calcined in cement production and cut into blocks of a certain size known as "dimension stone". The reaction of dolomite with acid also makes it useful. It is used to neutralize acids in the chemical industry, in stream reclamation projects, and as a soil conditioner. Dolomite is used as a source of magnesia (MgO), a feed additive for livestock, a sintering agent and flux in mineral processing, and as an ingredient in the production of glass, bricks, and ceramics. Dolomite is the host rock for many lead, zinc, and copper deposits. These deposits form when hot and acidic hydrothermal solutions travel from the depths through the fault system in front of the dolomite unit. These solutions react with dolomite, lowering the pH which results in the precipitation of minerals from the solution. Dolomite also serves as an oil and gas reservoir. During the conversion of calcite to dolomite, a decrease in volume occurs. This can lead to porous areas in the rock that can be filled with oil or natural gas migrating to them c 
dolomite calcite rock
What is dolomite and calcite rock? Calcite and dolomite are common as primary minerals in a variety of sedimentary and metamorphic rocks. It can also be formed as secondary minerals. Calcite is CaCO3. Dolomite is CaMg (CO3) 2. Calcite, calcium carbonate, is the most common calcium carbonate. We admire its beautiful crystal shapes, 600 in total. We also use it in large quantities in its massive form, limestone. Dolomite, calcium, and magnesium carbonate, is not as common as calcite. It also forms into beautiful crystals, but not in the wide variety that calcite does. We also use dolomite in its massive form, dolomite. Which raises two questions: "How to distinguish calcite and dolomite?" and "How do we distinguish between limestone and dolomite?"
- distinguishing features
The first question is relatively easy to answer. Dolomite never forms in scalenohedral crystals or "dog's tooth" crystals, which are one of the common forms of calcite. Calcite also forms flat and rhombic "poker chip" crystals, but dolomite does not. Calcite responds strongly to acid, while dolomite responds less strongly. Calcite is 3 on the Mohs hardness scale, but dolomite is only 4-4.5 Mohs. Another difference you can see is the smoothness of the crystal faces in your sample. Dolomite crystals, due to their unusual internal structure, can have slightly curved crystal faces, while calcite does not. Here are some simple tests you can use to determine what type of carbonate you have. 
The second question is much more difficult to answer. Limestone and dolomite are carbonate rocks, but there is little difference on the outside. The distinction really lies in the atomic structure of this carbon. Scientists have a name for what's going on: homologous replacement. Some elements have the ability to replace each other in the atomic structure of the molecules of the developing metal. This is possible because the atoms of different elements can be the same or nearly the same size. They can also have the same electronic valency and atomic size to fit the structure of the molecule. Calcium and magnesium are two of these elements. When calcium carbonate crystallizes, calcite crystals are the most likely outcome. But if enough of the element is present, the magnesium atoms can displace some of the calcium atoms, and the result is calcium, magnesium carbonate, or dolomite. This symmetric substitution plays its role in limestone and dolomite. Limestone is the most common calcium carbonate rock. They form on the bottoms of the ocean, often formed in part by the remains of extruded sea creatures. It's always something impure, but limestone is one of the principal sedimentary rocks throughout the American Midwest. We mine it, use it for road materials, make cement, cut it into building blocks and use it in ordinary public buildings. Midwest limestone is brown or orange in color, and is also commonly used in home construction. When limestone has little inclusion, it is white, or nearly so, and we use it to mark graves, monuments, and important public buildings, such as the Presidential Monuments in Washington, D.C. When exposed to heat and pressure, limestone crystallizes enough to form the hard, sugary-texture rock that we call marble. Artists love it as a sculptural material, especially when it's white. Therefore, we tend to name calcium carbonate sedimentary rocks with colors ranging from gray to dark brown and white limestone. But is this true? 
The problem is that calcium carbonate can be so impure that it forms a different rock, dolomite limestone or, as scientists now call it, dolomite. We even call an entire mountain range in southern Europe the Dolomites! Italian Alps. It is of particular interest to mineralogists because this is where D. Dolomieu was first introduced to the mineral dolomite. He realized it was unusual because it was a carbonate containing both calcium and magnesium. Other studies have shown that dolomite rock is a new mineral. The rocks and mountains from which Dolomieu obtained his samples were transported.
0
0