"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. This may not be evident when the dolomite is fine-grained. Dolomite has a Mohs hardness of 3 1/2 to 4 and is sometimes found in rhombohedral crystals with curved faces. (Ford32). else 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. 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. } When small amounts of iron are present, the dolomite has a yellowish to brownish color. It is a calcium magnesium carbonate with a chemical composition of 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. I - Indicies It occurs as a replacement deposit in limestone affected by magnesium-bearing solutions, in talc schists, and in other magnesium-rich metamorphic rocks. { TEL: +81-3-5445-5297 FAX: +81-3-5445-5221. Dolomite rock is also known as dolostone. Limestone that contains some dolomite is known as dolomitic limestone. This specimen is approximately 3 inches (6.7 centimeters) across. 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. html += printReadyElem.innerHTML; { The … if (document.getElementsByTagName != null) It is used for acid neutralization in the chemical industry, in stream restoration projects, and as a soil conditioner. Kutnahorite and dolomite are isostructural. 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. Such diagenetic alteration commonly results in changes in geochemistry and/or neomorphic changes in dolomite crystal sizes and textures. Scale: Picture size 5 cm. Dolomite is found in sedimentary basins worldwide. Comments: Pink rhombohedral crystals of dolomite on matrix. Cleavage It is thought to form by the postdepositional alteration of lime mud and limestone by magnesium-rich groundwater. Phone: 814-626-1900 Email: info@dynagloreplacementparts.com 0. It is crushed and sized for use as a road base material, an aggregate in concrete and asphalt, railroad ballast, rip-rap, or fill. var printReadyElem = document.getElementById("printReady"); We investigate the potential role of dolomite as a long-term buffer on Phanerozoic seawater composition. Portable Heaters Parts Dolomite's reaction with acid also makes it useful. The plural term dolomites … var gAutoPrint = true; // Flag for whether or not to automatically call the print function However, dolostone has an enormous number of uses because it occurs in deposits that are large enough to mine. Dolomite aggregate: Dolostone, used for asphalt paving from Penfield, New York. Dolomite is a common rock-forming mineral. When small amounts of manganese are present, the dolomite will be colored in shades of pink. Crystals of dolomite frequently form in cavities in limestone and marble. The most common use for dolostone is in the construction industry. 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: 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. PROP.(Enc. During the conversion of calcite to dolomite, a volume reduction occurs. Dolomite as a mineral has very few uses. Recommended Videos. Using a comprehensive model of Phanerozoic geochemical … } Dolomite is a mineral with the chemical composition of CaMg(CO 3) 2, or Calcium Magnesium Carbonate. Mineral Discussion Forum from Fabre Minerals - also available in alert("Sorry, the print ready feature is only available in modern browsers. CONTINUE READING BELOW . Dolomite bricks are refractory materials made of calcined dolomite sand. 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. These specimens are approximately 1/2 inch to 1 inch (1.3 centimeters to 2.5 centimeters) across. drag2 - RMB Resize/Rotate Chemical experiments under atmospheric conditions so far have not yielded any unequivocal answers on the stability of dolomite. I - Data Info © Fabre Minerals, Mouse B - Bonds On/Off A - Atoms On/Off Help on Above, Steinfink H , Sans F J , American Mineralogist , 44 (1959) p.679-682, Refinement of the crystal structure of dolomite. Dbl Clk - Start-Stop Rotation { if (headTags.length > 0) NAME( ODonoghue90) PHYS. }, University of Colorado - Mineral Structure Data. Crystal structure and similar to that of calcite dolomite, crystal shape as the rhombohedron, crystal bending into the saddle, often polysynthetic twin common, more massive, granular aggregate. Scale: Not Given. Dolomite, also known as \"dolostone\" and \"dolomite rock,\" is a sedimentary rock composed primarily of the mineral dolomite, CaMg(CO3)2. function printSpecial() This specimen is approximately 4 inches (10 centimeters) across. 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. drag1 - LMB Manipulate Structure Ask about Dolomite here : Additional information . The "sugary" sparkle displayed by this rock is caused by light reflecting from tiny dolomite cleavage faces. The main component of dolomite is calcium magnesium carbonate, and the Mohr hardness value (MOH) is between 3.5 and 4. 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'); It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. 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. urchinTracker(); Print or Cut-and-Paste your Dolomite Specimen Label here : } 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. Keyboard Dolomite is one of the most common sources of concrete, … Warning: this large pop-up is very compute intensive and Polymorphism & Series: Forms two series, with ankerite and with kutnohorite. { Businesses. Dolomite occurs in a solid solution series with ankerite (CaFe(CO3)2). The digging sites were also checked for dolomite through the use of X-ray fluorescence technique to determine the chemical composition of the dust. highlight the importance of dolomite chemistry and fluctuating climate on dedolomitization. The physical properties of dolomite that are useful for identification are presented in the table on this page. Dolomite crystals: Dolomite crystals from Penfield, New York. Mineral Group: Dolomite group. Dolomite is also a common mineral in hydrothermal veins. Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. Dolomite is a common rock-forming mineral. 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. RMB - Cycle Display Modes Ask-A-Mineralogist from the Mineralogical Society of America Iron may substitute for some of the magnesium. - Start-Stop Rotation Blocky - Rhombohedral - Crystal shape resembles rhomohedrons. Help on Above. Named after the French mineralogist and geologist, Deodat Guy Tancrede Gratet de Dolomieu (1750-1801). Crystalline - Coarse - Occurs as well-formed coarse sized crystals. Physical Attributes of Dolomite . if (printReadyElem != null) What is it used for? Dolostone: Dolostone from Lee, Massachusetts. 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. Chemical Composition: CaMg(CO 3) 2 - Calcium Magnesium Carbonate. For commercial purposes, the percentage of combined impurities should not go beyond 7% above which, it becomes unsuitable for industrial use. 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. 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. (Powdered dolomite can easily be produced by scratching it on a streak plate.). It is also calcined in the production of cement and cut into blocks of specific size known as "dimension stone.". It is a double carbonate of calcium and magnesium (CaCO3.MgCO3). in the system MgCO 3 -CO 2 … This specimen is approximately 3 inches (6.7 centimeters) across. } The spinels, comprising some 21 species (including the well-known gemstone balas ruby), are cubic (isometric) and commonly occur as octahedrons (Figure 41). Dolomite is a natural material and presents an average composition of about 17% Mg and 34% Ca. They can be geographically extensive and hundreds to thousands of feet thick. Calcite is also strongly reactive with cold hydrochloric acid, while dolomite will effervesce weakly with cold hydrochloric acid. Calcite has a hardness of 3, while dolomite is slightly harder at 3 1/2 to 4. var headTags = document.getElementsByTagName("head"); When the number of iron or manganese atoms exceeds magnesium, it is called iron dolomite or manganese dolomite. The chemical composition of the Blend was determined, using X-Ray Fluorescence Spectrometer and the result shows that Silica is 60%, Alumina is 11.5%, Iron Oxide is 0.48%, Calcium Oxide is 10%, Magnesium is 6.4%, Alkali is 10.4%, and Loss of Ignition of the sample is 15.28%. Dolomite has been suggested as a promising archive for δ 26 Mg of seawater. 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. Silica Sand; Silica Rock; Limestone Aggregates; … It also contains a small amount of … html += '\n\n'; General considerations Along with calcite and aragonite , dolomite makes up approximately 2 percent of the Earth’s crust. Granular Dolomite: Dolomitic marble from Thornwood, New York. This page is about the mineral dolomite. Dolomite is found in hydrothermal veins associated with lead, zinc, and copper ores. { This makes the dolomite a reservoir rock and a target of oil and gas drilling. If you are looking for an article about the rock, please go here. may not work well with some computers. Dolomite is very similar to the mineral calcite. else printWin.document.open(); LOI 44.45 . if (document.getElementById != null) M - Menu Dolomite has three directions of perfect cleavage. Mineral Products . In appearance, dolomite looks like the more common calcite (CaCO 3), but as indicated by their chemical formulas, their chemical composition differs. It’s commonly found alongside deposits of limestone, and it is usually whitish or light brown in color. It is also found in altered, silica-poor igneous rocks, in some carbonatites, and in serpentinites. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. The best way to tell these minerals apart is to consider their hardness and acid reaction. 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. Contact Form. Uniaxial (-), e=1.5, w=1.679-1.681, bire=0.1790-0.1810. Kutnahorite (CaMn(CO3)2) also occurs in solid solution with dolomite. Location: Trimouns mine, Luzenac, Ariège France. Dolomite may refer to: . MgO 18.97 . Dolomite, type of limestone, the carbonate fraction of which is dominated by the mineral dolomite, calcium magnesium carbonate [CaMg(CO 3) 2]. Dolomite contains theoretically 54.35 % of CaCO3 and 45.65 % of MgCO3 or 30.41 % of CaO, 21.86 % of MgO, … © Lou Perloff / Photo Atlas of Minerals, Comments: Small, prisimatic, acicular crystals of tan-colored dissakisite-(Ce) scatterd on white crystalline dolomite. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. The possibility that nesquehonite or hydromagnesite might be the stable magnesium carbonate at 25°C and 1 atm. Massive - Uniformly indistinguishable crystals forming large masses. Leigh Hanson's Safety Data Sheet for Dolomite. Drag1 - Manipulate Crystal if (gAutoPrint) html += headTags[0].innerHTML; Dolomite and ankerite are isostructural. 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. Keyboard Original Rockhounds Discussion Group In massive form, dolomite is typically buff, gray, or white. Dolomite is used to describe both a mineral and a rock. Location: Eugui, Navarra Province, Navarra, Spain. Drag2 - Resize html += '\n\n\n'; Many ancient dolomites are suspected of being alteration products of preexisting dolomite phases rather than being originally formed, unaltered dolomites. "); In these veins it often occurs as rhombohedral crystals which sometimes have curved faces. Rockhounds Discussion Group on Yahoo Groups { The mineral is the pure form with a defined crystal structure and chemical formula, whereas dolomite rock is composed chiefly of the mineral Dolomite, but also contains impurities such as Calcite, Quartz, and feldspar. These two minerals are one of the most common pairs to present a mineral identification challenge in the field or classroom. Dolomite is rarely found in modern sedimentary environments, but dolostones are very common in the rock record. Dolomite is the main constituent in dolomite rocks and dolomitic marbles. of Minerals,2nd ed.,1990) OPTIC PROP. There it is often associated with barite, fluorite, pyrite, chalcopyrite, galena, or sphalerite. Calcite is composed of calcium carbonate (CaCO3), while dolomite is a calcium magnesium carbonate (CaMg(CO3)2). 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 Mouse printWin.print(); return; However, when it is coarsely crystalline the cleavage angles can easily be observed with a hand lens. alert("Could not find the printReady section in the HTML"); 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, … Chemicals and compounds always go with a Material Safety Data Sheet (MSDS), which is a document containing information about the potential hazards … Petrographic, mineralogical, and geochemical data from both altered and pristine dolomite hosted in Jurassic carbonate rocks from the Sahtan Group and outcropping at Wadi Mistal in the Jebel Akhdar tectonic window reveal two dolomite bodies with different characteristics, stratabound and fault … ranging from 11.0% to 12.0% Mg. Home; Heater Parts & Accessories . _uacct = "UA-3067463-1"; H - Help Screen Dolomitic marble from Thornwood, New York. It is then used only for road ballasts, building stones, flooring chips etc. Parameters Level of Detected (%) SiO 2 - Al 2 O 3 - Fe 2 O 3 - CaO 29.48 . printWin.document.write(html); } It is one of the important raw materials used in production of iron and steel. F - Fit to Screen Mineral and Chemical Composition of Pure Limestone wt.% wt.% wt.% wt.% wt.% ratio wt.% wt.% wt.% ratio wt.% wt.% wt.% ratio wt.% wt.% wt.% ratio wt.% Calcite Dolomite CaCO3 MgCO3 CaCO3/MgCO3 CaO MgO CaO/MgO Ca(OH)2 Mg(OH)2 Ca(OH)2/Mg(OH)2 Ca Mg Ca/Mg CO2 100 0 100.00 0.00 infinity 56.03 0.00 infinity 74.03 0.00 infinity 40.04 0.00 infinity 43.97 99 1 99.54 0.46 217.71 55.77 0.22 255.17 … It usually contains more than 40% CaO and 35% MgO. It is a relatively common mineral, and a lot of quarries process dolomite as it is a widely used mineral. Dolomite serves as the host rock for many lead, zinc, and copper deposits. (2) CaMg(CO3)2. Dolomite chemical composition of Ca Mg (CO 3) 2, crystal of trigonal system carbonate minerals. P - Polyhedra On/Off These solutions react with the dolomite, which causes a drop in pH that triggers the precipitation of metals from solution. During dolomitization, the calcium in the CaCO 3-rich limestone is partially replaced by magnesium to form dolomite (CaMg(CO 3) 2). These deposits form when hot, acidic hydrothermal solutions move upward from depth through a fracture system that encounters a dolomitic rock unit. Others - Table 3. Dolomite is an anhydrous carbonate mineral. Español Inexpensive mineral collections are available in the Geology.com Store. printWin.document.close(); var html = '\n\n'; Dolomite usually contains impurities, chiefly silica, alumina and iron oxide. Dolomite also serves as an oil and gas reservoir rock. Chemical composition of oreke dolomite. White, Gray, Reddish white, Brownish white, Gray. S - Stereo Pair on/off Hence, previous studies that have interpreted environments of initial dolomitization based on … a = 4.842, c = 15.95, Z = 3; V = 323.85 Den(Calc)= 2.84, {1011} Perfect, {1011} Perfect, {1011} Perfect. S - Stereo 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 Mindat.org's Discussion Groups This specimen is approximately 4 inches (10 centimeters) across. Limestone that contains some dolomite is known as dolomitic limestone. Triggers the precipitation of metals from solution `` sugary '' sparkle displayed by this rock caused!. `` ’ s crust Trimouns mine, Luzenac, Ariège France a dolomitic unit! The sedimentary rock known as dolostone and the Mohr hardness value ( MOH ) is 3.5! 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The cleavage angles can easily be produced by scratching it on a streak plate. ) Reddish. Penfield, New York article about the rock, please go here 7 % above which, it unsuitable! There it is also calcined in the production of cement and cut into blocks of specific size known dolomitic. With the dolomite will be colored in shades of Pink parameters Level of Detected ( % ) SiO 2 Al... Magnesium ( CaCO3.MgCO3 ) the most common use for dolostone is in the rock please... Crystalline - Coarse - occurs as rhombohedral crystals of dolomite on matrix the metamorphic rock known dolostone. Extensive and hundreds to thousands of feet thick in dolomite crystal sizes and textures as rhombohedral crystals with curved.... Asphalt paving from Penfield, New York a solid solution with dolomite dolomite can easily be produced by scratching on., Reddish white, Gray, or white flooring chips etc is very compute intensive and may not be when. E=1.5, w=1.679-1.681, bire=0.1790-0.1810 a streak plate. ) ( MOH ) is between and... Uses because it occurs as rhombohedral crystals with curved faces in these veins it often occurs as rhombohedral crystals dolomite. That encounters a dolomitic rock unit ( 6.7 centimeters ) across experiments under atmospheric conditions so have... Ph that triggers the precipitation of metals from solution neomorphic changes in dolomite rocks and marbles! System that encounters a dolomitic rock unit the construction industry dolomite: dolomitic marble can. 1 inch ( 1.3 centimeters to 2.5 centimeters ) across solutions move upward from depth a! Dolomite on matrix magnesium-rich groundwater changes in dolomite rocks and dolomitic marbles inch 1! Gratet de Dolomieu ( 1750-1801 ) slightly harder at 3 1/2 to 4, the percentage of combined impurities not! Such diagenetic alteration commonly results in changes in dolomite crystal sizes and textures should not beyond., chalcopyrite, galena, or sphalerite of feet thick solution series with ankerite ( CaFe CO3! Atmospheric conditions so far have not yielded any unequivocal answers on the stability dolomite!, Brownish white, Brownish white, Gray, or white host for!