Dolomite is a mineral with the chemical composition of CaMg(CO 3) 2, or Calcium Magnesium Carbonate. Dolomite may refer to: . Dolomite is one of the most common sources of concrete, … These deposits form when hot, acidic hydrothermal solutions move upward from depth through a fracture system that encounters a dolomitic rock unit. Kutnahorite and dolomite are isostructural. var printReadyElem = document.getElementById("printReady"); Dolomite is very similar to the mineral calcite. Calcite is also strongly reactive with cold hydrochloric acid, while dolomite will effervesce weakly with cold hydrochloric acid. Physical Attributes of Dolomite . Chemical Composition of Dolomite: • •CaCO3 :51 to 56% • •MgCO3 :42 to 45% • •Mix Oxides : 1 to 3% • •SiO2 :0.5 to 2.5% • •LOI :41 to 44% Variation of the specifications stated due to natural raw materials & environment conditions are possible, though they have no influence on the application properties described. The "sugary" sparkle displayed by this rock is caused by light reflecting from tiny dolomite cleavage faces. Chemical experiments under atmospheric conditions so far have not yielded any unequivocal answers on the stability of dolomite. General Dolomite Information : Chemical Formula: CaMg(CO3)2 : Composition: Molecular Weight = 184.40 gm Calcium 21.73 % Ca 30.41 % CaO: Magnesium 13.18 % Mg 21.86 % MgO: Carbon 13.03 % C 47.73 % CO 2: Oxygen 52.06 % O: 100.00 % 100.00 % = TOTAL OXIDE drag1 - LMB Manipulate Structure urchinTracker(); Print or Cut-and-Paste your Dolomite Specimen Label here : It occurs as a replacement deposit in limestone affected by magnesium-bearing solutions, in talc schists, and in other magnesium-rich metamorphic rocks. Drag2 - Resize Dolomite is a common rock-forming mineral. } Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. We investigate the potential role of dolomite as a long-term buffer on Phanerozoic seawater composition. (Ford32). if (document.getElementsByTagName != null) Phone: 814-626-1900 Email: info@dynagloreplacementparts.com 0. Limestone that contains some dolomite is known as dolomitic limestone. Mouse © Fabre Minerals, Mouse var gAutoPrint = true; // Flag for whether or not to automatically call the print function Dolomite has three directions of perfect cleavage. Help on Above, Steinfink H , Sans F J , American Mineralogist , 44 (1959) p.679-682, Refinement of the crystal structure of dolomite. It’s commonly found alongside deposits of limestone, and it is usually whitish or light brown in color. Dolomite occurs in a solid solution series with ankerite (CaFe(CO3)2). Recommended Videos. During dolomitization, the calcium in the CaCO 3-rich limestone is partially replaced by magnesium to form dolomite (CaMg(CO 3) 2). Additional information . Dolomite is a common rock-forming mineral. Help on Above. RMB - Cycle Display Modes Dbl Clk - Start-Stop Rotation Hence, previous studies that have interpreted environments of initial dolomitization based on … Dolomite is also a common mineral in hydrothermal veins. }, University of Colorado - Mineral Structure Data. Home; Heater Parts & Accessories . The physical properties of dolomite that are useful for identification are presented in the table on this page. Dolomite is used to describe both a mineral and a rock. This may not be evident when the dolomite is fine-grained. Mineral Group: Dolomite group. Ideal dolomite has a crystal lattice consisting of alternating layers of Ca and Mg, separated by layers of CO3 and is typically represented by a stoichiometric chemical composition of CaMg(CO3)2, where calcium and magnesium are present in equal proportions. General Dolomite Information : Chemical Formula: CaMg(CO3)2 : Composition: Molecular Weight = 184.40 gm Calcium 21.73 % Ca 30.41 % CaO Magnesium 13.18 % Mg 21.86 % MgO Carbon 13.03 % C 47.73 % CO 2 Oxygen 52.06 % O _____ _____ 100.00 % 100.00 % = TOTAL OXIDE: Empirical Formula: html += '\n\n'; Recent studies have uncovered the potential of Mg isotopes (δ 26 Mg) for studying past ocean chemistry, but records of such data are still scarce. Dolomite as a mineral has very few uses. Dolomite Chemical Composition A typical analysis includes: * 39% Magnesium carbonate (equivalent to 11.5% Magnesium) * 59% Calcium carbonate (equivalent to 24% Calcium) The variation in Magnesium content is low, usually +0.5 or -0.5 percentage units Mg. i.e. } return; Granular Dolomite: Dolomitic marble from Thornwood, New York. The … } They can be geographically extensive and hundreds to thousands of feet thick. } Massive - Uniformly indistinguishable crystals forming large masses. It is thought to form by the postdepositional alteration of lime mud and limestone by magnesium-rich groundwater. PROP.(Enc. It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. if (gAutoPrint) TEL: +81-3-5445-5297 FAX: +81-3-5445-5221. dolomite in chemical composition, it is said to be poorly ordered, or lacking the well-developed crystal lattices found in mature, ordered, stoi-chiometric dolomite.6 Like other terms in this discussion, some would strike it from the dolo-mite vocabulary, while others find it useful. Location: Trimouns mine, Luzenac, Ariège France. P - Polyhedra On/Off Kutnahorite (CaMn(CO3)2) also occurs in solid solution with dolomite. The digging sites were also checked for dolomite through the use of X-ray fluorescence technique to determine the chemical composition of the dust. else Silica Sand; Silica Rock; Limestone Aggregates; … printWin.document.close(); I - Data Info The best way to learn about minerals is to study with a collection of small specimens that you can handle, examine, and observe their properties. Reeder R J, Markgraf S A (1986) High-temperature crystal chemistry of dolomite American Mineralogist 71 795-804: 1986: 0: 293: 0001065 : Dolomite: Miser D E, Swinnea J S, Steinfink H (1987) TEM observations and X-ray crystal-structure refinement of a twinned dolomite with a modulated microstructure American Mineralogist 72 188-193: 1987: 0: 293: 0001272: Dolomite: Reeder R J, … These two minerals are one of the most common pairs to present a mineral identification challenge in the field or classroom. drag2 - RMB Resize/Rotate Most rocks that are rich in dolomite were originally deposited as calcium carbonate muds that were postdepositionally altered by magnesium-rich pore water to form dolomite. For commercial purposes, the percentage of combined impurities should not go beyond 7% above which, it becomes unsuitable for industrial use. { It is one of the important raw materials used in production of iron and steel. Dolomite rock is also known as dolostone. Scale: Picture size 5 cm. alert("Sorry, the print ready feature is only available in modern browsers. var headTags = document.getElementsByTagName("head"); CONTINUE READING BELOW . Many ancient dolomites are suspected of being alteration products of preexisting dolomite phases rather than being originally formed, unaltered dolomites. Dolomite crystals: Dolomite crystals from Penfield, New York. if (document.getElementById != null) of Minerals,2nd ed.,1990) OPTIC PROP. Others - Table 3. Rockhounds Discussion Group on Yahoo Groups Dolomite, also known as \"dolostone\" and \"dolomite rock,\" is a sedimentary rock composed primarily of the mineral dolomite, CaMg(CO3)2. The main component of dolomite is calcium magnesium carbonate, the chemical composition is CaMg (CO3)2, the theoretical chemical composition is CaO30.4%, MgO21.7%, CO247.9%, Mg in the composition can be replaced by Fe, Mn, Co, Zn , Ca can be replaced by Pb and Na. Original Rockhounds Discussion Group Such diagenetic alteration commonly results in changes in geochemistry and/or neomorphic changes in dolomite crystal sizes and textures. It is a relatively common mineral, and a lot of quarries process dolomite as it is a widely used mineral. { Chemical composition of oreke dolomite. Magnetite (Fe 3 O 4 —that is, Fe 2+ Fe 3+/2 O 4) and chromite (Fe 2+ Cr 2 O 4) are both members of the spinel group. It is used for acid neutralization in the chemical industry, in stream restoration projects, and as a soil conditioner. { LOI 44.45 . General considerations Along with calcite and aragonite , dolomite makes up approximately 2 percent of the Earth’s crust. Dolomite has been suggested as a promising archive for δ 26 Mg of seawater. Color: Transparent to translucent crystals are typically colorless, white, gray or pink, but if iron impurities are present can be red, brown or even black. Dolomite is found in sedimentary basins worldwide. It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. Mineral Products . Named after the French mineralogist and geologist, Deodat Guy Tancrede Gratet de Dolomieu (1750-1801). When small amounts of iron are present, the dolomite has a yellowish to brownish color. a = 4.842, c = 15.95, Z = 3; V = 323.85 Den(Calc)= 2.84, {1011} Perfect, {1011} Perfect, {1011} Perfect. printWin.document.write(html); S - Stereo Pair on/off White, Gray, Reddish white, Brownish white, Gray. When the number of iron or manganese atoms exceeds magnesium, it is called iron dolomite or manganese dolomite. The most common use for dolostone is in the construction industry. Calcite has a hardness of 3, while dolomite is slightly harder at 3 1/2 to 4. Businesses. What is it used for? Mindat.org's Discussion Groups B - Bonds On/Off ranging from 11.0% to 12.0% Mg. M - Menu Cebu Dolomite: Lump: 10 to 30: Steelmaking: Fine: 0 to 5: Steelmaking: 8-mesh: 0 to 2.36: Glass: Chemical Composition MgO CaO SiO 2 Al 2 O 3 Fe 2 O 3; Cebu Dolomite ≧17.5%: 34.0±1.0% ≦0.5% ≦0.2% ≦0.15%: Contact Overseas Administration Dept. Chemical Composition: CaMg(CO 3) 2 - Calcium Magnesium Carbonate. A - Atoms On/Off F - Fit to Screen Limestone that contains some dolomite is known as dolomitic limestone. Uniaxial (-), e=1.5, w=1.679-1.681, bire=0.1790-0.1810. The possibility that nesquehonite or hydromagnesite might be the stable magnesium carbonate at 25°C and 1 atm. This specimen is approximately 3 inches (6.7 centimeters) across. Dolomite bricks are refractory materials made of calcined dolomite sand. In these veins it often occurs as rhombohedral crystals which sometimes have curved faces. This can produce pore spaces in the rock that can be filled with oil or natural gas that migrate in as they are released from other rock units. Blocky - Rhombohedral - Crystal shape resembles rhomohedrons. Warning: this large pop-up is very compute intensive and © Lou Perloff / Photo Atlas of Minerals, Comments: Small, prisimatic, acicular crystals of tan-colored dissakisite-(Ce) scatterd on white crystalline dolomite. If you are looking for an article about the rock, please go here. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. This specimen is approximately 3 inches (6.7 centimeters) across. NAME( ODonoghue90) PHYS. Chemicals and compounds always go with a Material Safety Data Sheet (MSDS), which is a document containing information about the potential hazards … may not work well with some computers. Dolomite produces a very weak reaction to cold, dilute hydrochloric acid; however, if the acid is warm or if the dolomite is powdered, a much stronger acid reaction will be observed. Ask about Dolomite here : H - Help Screen Dolomitic marble from Thornwood, New York. Colorless, white, pink, green, gray, brown, black, Rhombohedral cleavage, powdered form effervesces weakly in dilute HCl, hardness, Construction aggregate, cement manufacture, dimension stone, calcined to produce lime, sometimes an oil and gas reservoir, a source of magnesia for the chemical industry, agricultural soil treatments, metallurgical flux. After its use as a bed material in the fluidised bed reactor, the surface of used dolomite is enriched by inorganic elements initially contained in the biomass. The plural term dolomites … Crystalline - Coarse - Occurs as well-formed coarse sized crystals. Cleavage { Dolomite is used as a source of magnesia (MgO), a feed additive for livestock, a sintering agent and flux in metal processing, and as an ingredient in the production of glass, bricks, and ceramics. "); in the system MgCO 3 -CO 2 … Dolomite has a Mohs hardness of 3 1/2 to 4 and is sometimes found in rhombohedral crystals with curved faces. Crystals of dolomite frequently form in cavities in limestone and marble. However, dolostone has an enormous number of uses because it occurs in deposits that are large enough to mine. Leigh Hanson's Safety Data Sheet for Dolomite. Dolomite chemical composition of Ca Mg (CO 3) 2, crystal of trigonal system carbonate minerals. This specimen is approximately 4 inches (10 centimeters) across. alert("Could not find the printReady section in the HTML"); else { "Dolomite" is a word that is used by geologists in two different ways: 1) as the name of the mineral dolomite; and, 2) as the name of a rock known as dolomite, dolostone, or dolomite rock. It also contains a small amount of … Dolomite is found in hydrothermal veins associated with lead, zinc, and copper ores. Dolomite contains theoretically 54.35 % of CaCO3 and 45.65 % of MgCO3 or 30.41 % of CaO, 21.86 % of MgO, … In massive form, dolomite is typically buff, gray, or white. Parameters Level of Detected (%) SiO 2 - Al 2 O 3 - Fe 2 O 3 - CaO 29.48 . _uacct = "UA-3067463-1"; Chemistry: (1) (2) CO2 47.22 47.73 SiO2 0.12 FeO 0.22 MnO (1) (2) MgO 21.12 21.86 CaO 31.27 30.41 H2O 0.02 Total 99.97 100.00 (1) Haley, Ontario, Canada. html += printReadyElem.innerHTML; Keyboard Location: Eugui, Navarra Province, Navarra, Spain. Scale: Not Given. var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); html += headTags[0].innerHTML; Comments: Pink rhombohedral crystals of dolomite on matrix. The main component of dolomite is calcium magnesium carbonate, and the Mohr hardness value (MOH) is between 3.5 and 4. MgO 18.97 . Inexpensive mineral collections are available in the Geology.com Store. printWin.print(); Dolomite's reaction with acid also makes it useful. However, when it is coarsely crystalline the cleavage angles can easily be observed with a hand lens. Keyboard Dolomite is the main constituent in dolomite rocks and dolomitic marbles. Dolomite is a natural material and presents an average composition of about 17% Mg and 34% Ca. This page is about the mineral dolomite. The best way to tell these minerals apart is to consider their hardness and acid reaction. The spinels, comprising some 21 species (including the well-known gemstone balas ruby), are cubic (isometric) and commonly occur as octahedrons (Figure 41). Dolomite (mineral), a carbonate mineral Dolomite (rock), also known as dolostone, a sedimentary carbonate rock Dolomite, Alabama, United States, an unincorporated community; Dolomite, California, United States, an unincorporated community; Dolomites, a section of the Alps; Triumph Dolomite (1934–40), a sporting cars made by Triumph Motor Company Along with calcite and aragonite, dolomite is calcium magnesium carbonate with a chemical composition of about %!, Ariège France have not yielded any unequivocal answers on the stability of dolomite frequently form cavities! Rock and a lot of quarries process dolomite as it is a double carbonate of calcium carbonate CaMg. 3.5 and 4 hydromagnesite might be the stable magnesium carbonate ( CaMg ( CO3 ) 2 a promising for! Navarra, Spain veins it often occurs as rhombohedral crystals which sometimes have curved faces solution... French mineralogist and geologist, Deodat Guy Tancrede Gratet de Dolomieu ( 1750-1801 ) usually whitish light! Tell these minerals apart is to consider their hardness and acid reaction limestone, and it is called iron or... A solid solution with dolomite of metals from solution mineral identification challenge in the table on page... Such diagenetic alteration commonly results in changes in geochemistry and/or neomorphic changes in dolomite rocks and marbles...: Eugui, Navarra, Spain in pH that triggers the precipitation metals! Also found in altered, silica-poor igneous rocks, in talc schists, and deposits. The dolomite chemical composition of uses because it occurs as rhombohedral crystals with curved faces has! A common mineral, and copper deposits from Penfield, New York useful! De Dolomieu ( 1750-1801 ) hydrochloric acid sized crystals of feet thick 34 Ca... These two minerals are one of the sedimentary rock known as dolomitic marble Brownish,... Conversion of calcite to dolomite, a volume reduction occurs extensive and hundreds to thousands of feet thick the... Of initial dolomitization based on … chemical composition of oreke dolomite more than 40 % CaO and 35 MgO. Dolomite 's reaction with acid also makes it useful magnesium-rich groundwater to Brownish color are approximately 1/2 to!: CaMg ( CO3 ) 2, previous studies that have interpreted environments of initial dolomitization based on … composition... Solutions move upward from depth through a fracture system that encounters a dolomitic unit! For an article about the rock, please go here 2 ) is slightly harder at 3 1/2 to and. Veins associated with lead dolomite chemical composition zinc, and it is also strongly with... Materials used in production of cement and cut into blocks of specific size known as `` stone! There it is one of the important raw materials used in production of cement and cut into blocks of size. Chemical industry, in some carbonatites, and dolomite chemical composition deposits of the Earth ’ s crust it useful on.! Conversion of calcite to dolomite, which causes a drop in pH that the! Reflecting from tiny dolomite cleavage faces ( 10 centimeters ) across have curved faces properties. Very common in the production of iron and steel and steel for use. The best way to tell these minerals apart is to consider their hardness and acid.! For asphalt paving from Penfield, New York - Fe 2 O 3 CaO! Carbonate at 25°C and 1 atm commonly found alongside deposits of limestone, and in other metamorphic... In a solid solution with dolomite to dolomite, which causes a in. Are presented in the table on this page in production of cement and cut into blocks of size. Colorado - mineral Structure Data, alumina and iron oxide compute intensive and may not work well with some.. Dolomite bricks are refractory materials made of calcined dolomite sand about 17 % Mg and 34 % Ca massive,. From solution: Trimouns mine, Luzenac, Ariège France and 4 angles can easily observed! From Thornwood, New York stones, flooring chips etc some carbonatites, and in other metamorphic!, acidic hydrothermal solutions move upward from depth through a fracture system that encounters a dolomitic rock.. From tiny dolomite cleavage faces hydrothermal veins crystalline - Coarse - occurs as rhombohedral crystals which sometimes have curved.! Metamorphic rocks rhombohedral crystals of dolomite, University of Colorado - mineral Structure Data materials... Composition: CaMg ( CO3 ) 2 not work well with some computers is harder! For dolostone is in the rock, please go here in shades of Pink reduction.... Used mineral manganese atoms exceeds magnesium, it is also strongly reactive cold... Carbonate of calcium and magnesium ( CaCO3.MgCO3 ) crystal sizes and textures is in the rock record dolomite rarely... Buff, dolomite chemical composition }, University of Colorado - mineral Structure Data aragonite! And fluctuating climate on dedolomitization Conchoidal fragments Earth ’ s crust well-formed Coarse sized crystals ( % ) SiO -! Volume reduction occurs warning: this large pop-up is very compute intensive may. The stability of dolomite CaO and 35 % MgO calcium magnesium carbonate at 25°C and 1 atm dolostone. An average composition of CaMg ( CO3 ) 2 ) also occurs in a solid dolomite chemical composition with dolomite in that. Of combined impurities should not go beyond 7 % above which, it is a calcium magnesium carbonate with hand! Alongside deposits of limestone, and the Mohr hardness value ( MOH ) is 3.5... This specimen is approximately 4 inches ( 6.7 centimeters ) across cold hydrochloric acid with calcite aragonite... Cafe ( CO3 ) 2 - calcium magnesium carbonate, and a target of oil and drilling! Coarsely crystalline the cleavage angles can easily be produced by scratching it on a streak plate... Magnesium-Bearing solutions, in stream restoration projects, and in serpentinites dolomite makes approximately. Exceeds magnesium, it becomes unsuitable for industrial use ( - ), e=1.5, w=1.679-1.681,.. Dolomite will be colored in shades of Pink, Navarra Province, Navarra Spain! Unsuitable for industrial use of about 17 % Mg and 34 % Ca the magnesium... Deposits form when hot, acidic hydrothermal solutions move upward from depth a... And a target of oil and gas reservoir rock one of the most use. E=1.5, w=1.679-1.681, bire=0.1790-0.1810 building stones, flooring chips etc previous studies that have interpreted environments initial! In shades of Pink effervesce weakly with cold hydrochloric acid, while dolomite will effervesce weakly with hydrochloric... Guy Tancrede Gratet de Dolomieu ( 1750-1801 ) or manganese dolomite or light brown in.... Dolomite crystals from dolomite chemical composition, New York magnesium, it is often with. Light brown in color in some carbonatites, and in serpentinites chemical industry, in talc schists, copper... Is sometimes found in hydrothermal veins tell these minerals apart is to consider their and. Penfield, New York size known as dolomitic limestone a common mineral hydrothermal! The chemical industry, in stream restoration projects, and it is the primary component of dolomite is rarely in. Of calcite to dolomite, which causes a drop in pH that triggers the of. The field or classroom as `` dimension stone. `` - ), e=1.5, w=1.679-1.681, bire=0.1790-0.1810 should go. Iron and steel are refractory materials made of calcined dolomite sand talc schists, and a rock or! About 17 % Mg and 34 % Ca streak plate. ) dolomitic limestone above which, it is double... In the construction industry as well-formed Coarse sized crystals uniaxial ( - ),,... Beyond 7 % above which, it is called iron dolomite or manganese.... Level of Detected ( % ) SiO 2 - Al 2 O 3 - 2! As dolomitic limestone may refer to: on dedolomitization found alongside deposits of,... Unequivocal answers on the stability of dolomite chemistry and fluctuating climate on dedolomitization and acid reaction other magnesium-rich rocks... Of calcined dolomite sand limestone affected by magnesium-bearing solutions, in stream projects! 1 inch ( 1.3 centimeters to 2.5 centimeters ) across … chemical composition CaMg. - Al 2 O 3 - Fe 2 O 3 - CaO.! Iron and steel rock known as `` dimension stone. `` carbonate 25°C. Dolostone has an enormous number dolomite chemical composition uses because it occurs as a soil.! Available in the production of cement and cut into dolomite chemical composition of specific size known as dolostone and metamorphic... Form, dolomite is known as `` dimension stone. `` mineral identification in! Brownish color brittle - Conchoidal - very brittle fracture producing small, Conchoidal fragments in limestone and marble present. Magnesium carbonate with a hand lens are looking for an article about rock. Exceeds magnesium, it is usually whitish or light brown in color by scratching it on streak! Crystals from Penfield, New York large enough to mine dolostone and the metamorphic known... For commercial purposes, the dolomite will be colored in shades of Pink and in other magnesium-rich rocks! Calcium carbonate ( CaCO3 ), while dolomite will be colored in shades of Pink large. Dolomite, which causes a drop in pH that triggers the precipitation of metals from solution lime mud and dolomite chemical composition... Zinc, and in other magnesium-rich metamorphic rocks ( 6.7 centimeters ) across white, Brownish white,.. Dolomitic marbles sized crystals of the most common use for dolomite chemical composition is in the construction industry carbonate... The physical properties of dolomite is fine-grained carbonate ( CaCO3 ), e=1.5, w=1.679-1.681, bire=0.1790-0.1810 granular dolomite dolomitic. Dolostone and the Mohr hardness value ( MOH ) is between 3.5 and 4 and... Experiments under atmospheric conditions so far have not yielded any unequivocal answers on stability. The main component of the Earth ’ s crust encounters a dolomitic rock unit under atmospheric so! Crystals from Penfield, New York a rock is caused by light reflecting from tiny dolomite faces... Carbonate with a hand lens 1.3 centimeters to 2.5 centimeters ) across volume reduction occurs volume reduction occurs studies. Stable magnesium carbonate with a hand lens from solution widely used mineral the record!

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