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Encyclopedia > Dolomite
Dolomite crystals

Dolomite (IPA: /ˈdɒləmʌɪt/) is the name of a sedimentary carbonate rock and a mineral, both composed of calcium magnesium carbonate CaMg(CO3)2 found in crystals. Dolomite is a mineral or rock type 18th century French naturalist Déodat Gratet de Dolomieu Alpine mountain range Dolomites 1970s automobile from British Leyland, see Triumph Dolomite 1975 blaxploitation film, see Dolemite The Son of Dolomite a sketch with Aries Spears on MadTV Category: ... Photograph of dolomite specimen from Touissite, Morocco taken by Dlloyd. ... Photograph of dolomite specimen from Touissite, Morocco taken by Dlloyd. ... Crystal (disambiguation) Insulin crystals A crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions. ... Articles with similar titles include the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabet”. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... Two types of sedimentary rock: limey shale overlaid by limestone. ... Carbonate rocks are a class of sedimentary rocks composed primarily of carbonate minerals. ... For other uses, see Mineral (disambiguation). ... For other uses, see Calcium (disambiguation). ... General Name, symbol, number magnesium, Mg, 12 Chemical series alkaline earth metals Group, period, block 2, 3, s Appearance silvery white solid at room temp Standard atomic weight 24. ... Ball-and-stick model of the carbonate ion, CO32− For other meanings, see Carbonate (disambiguation) In chemistry, a carbonate is a salt or ester of carbonic acid. ... For other uses, see Crystal (disambiguation). ...


Dolomite rock (also dolostone) is composed predominantly of the mineral dolomite. Limestone that is partially replaced by dolomite is referred to as dolomitic limestone, or in old U.S. geologic literature as magnesian limestone. Dolomite was first described in 1791 as the rock by the French naturalist and geologist, Déodat Gratet de Dolomieu (1750-1801) for exposures in the Dolomite Alps of northern Italy. Dolostone is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite. ... For other uses, see Limestone (disambiguation). ... Table of natural history, 1728 Cyclopaedia Natural history is an umbrella term for what are now often viewed as several distinct scientific disciplines of integrative organismal biology. ... The Geologist by Carl Spitzweg A geologist is a contributor to the science of geology, studying the physical structure and processes of the Earth and planets of the solar system (see planetary geology). ... Deodat de Dolomieu Dieudonné Sylvain Guy Tancrède de Dolomieu usually known as Déodat de Dolomieu (Dolomieu near La Tour-du-Pin, June 23, 1750 - Chateuneuf November 28, 1801) was a French geologist; the rock Dolomite was named after him. ... The Dolomites are a section of the Alps. ...

Contents

Properties

The mineral dolomite crystallizes in the trigonal - rhombohedral system. It forms white, gray to pink, commonly curved crystals, although it is usually massive. It has physical properties similar to those of the mineral calcite, but does not rapidly dissolve or effervesce (fizz) in dilute hydrochloric acid. The Mohs hardness is 3.5 to 4 and the specific gravity is 2.85. Refractive index values are nω = 1.679 - 1.681 and nε = 1.500. Crystal twinning is common. A solid solution series exists between dolomite and iron rich ankerite. Small amounts of iron in the structure give the crystals a yellow to brown tint. Manganese substitutes in the structure also up to about three percent MnO. A high manganese content gives the crystals a rosy pink color noted in the image above. A series with the manganese rich kutnohorite may exist. Lead and zinc also substitute in the structure for magnesium. In crystallography, the rhombohedral (or trigonal) crystal system is one of the 7 lattice point groups. ... Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico. ... The chemical compound hydrochloric acid is the aqueous (water-based) solution of hydrogen chloride gas (HCl). ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. ... It has been suggested that twin boundary be merged into this article or section. ... For other uses, see Iron (disambiguation). ... Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the dolomite family with formula: Ca(Fe,Mg,Mn)(CO3)2. ... General Name, symbol, number manganese, Mn, 25 Chemical series transition metals Group, period, block 7, 4, d Appearance silvery metallic Standard atomic weight 54. ... Kutnohorite is a rare calcium manganese magnesium iron carbonate mineral with formula Ca(Mn,Mg,Fe)(CO3)2. ... This article is about the metal. ... General Name, symbol, number zinc, Zn, 30 Chemical series transition metals Group, period, block 12, 4, d Appearance bluish pale gray Standard atomic weight 65. ...

Dolomite from Morocco
Dolomite from Morocco
Dolomite
Dolomite

Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ...

Uses

Pale pink crystals of dolomite with a slight pearly luster
Pale pink crystals of dolomite with a slight pearly luster

Dolomite is used as an ornamental stone, as a raw material for the manufacture of cement, and as a source of magnesium oxide. It is an important petroleum reservoir rock, and serves as the host rock for large strata-bound Mississippi Valley-Type (MVT) ore deposits of base metals (that is, readily oxidized metals) such as lead, zinc, and copper. Where calcite limestone is uncommon or too costly, dolomite is sometime used in its place as a flux (impurity remover) for the smelting of iron and steel. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... An ornamental stone is a stone used as a decoration. ... For other uses, see Cement (disambiguation). ... Magnesium oxide, or magnesia, is a white solid mineral that occurs naturally as periclase and is a source of magnesium. ... Pumpjack pumping an oil well near Lubbock, Texas Ignacy Łukasiewicz - inventor of the refining of kerosene from crude oil. ... An oil reservoir, petroleum system or petroleum reservoir is often thought of as being an underground lake of oil, but it is actually composed of hydrocarbons contained in porous rock formations. ... Carbonate-hosted lead-zinc ore deposits are important and highly valuable concentrations of lead and zinc sulfide ores hosted within carbonate (limestone, marl, dolomite) formations and which share a common genetic origin. ... Iron ore (Banded iron formation) Manganese ore Lead ore Gold ore An ore is a volume of rock containing components or minerals in a mode of occurrence which renders it valuable for mining. ... In chemistry, the term base metal is used informally to refer to a metal that oxidizes or corrodes relatively easily, and reacts variably with diluted hydrochloric acid (HCl) to form hydrogen. ... This article is about the metal. ... General Name, symbol, number zinc, Zn, 30 Chemical series transition metals Group, period, block 12, 4, d Appearance bluish pale gray Standard atomic weight 65. ... For other uses, see Copper (disambiguation). ... Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico. ... For other uses, see Limestone (disambiguation). ... In metallurgy, flux is a substance which removes passivating oxides from the surface of a metal or alloy. ... Smelting rhymes with melting Electric phosphate smelting furnace in a TVA chemical plant (1942) Chemical reduction, or smelting, is a form of extractive metallurgy. ...


In horticulture, dolomite and dolomitic limestone are added to soils and soilless potting mixes to lower their acidity ("sweeten" them). Home and container gardening are common examples of this use.


As nutritional supplement

In nutrition, dolomite is sold sometimes as a dietary supplement on the assumption that it should make a good simultaneous source of the two important elemental nutrients calcium and magnesium. However, since dolomites from Mississippi Valley-Type ore regions such as the Old Lead Belt and New Lead Belt in southeastern Missouri often include significant levels of lead and other toxic elements, users should always verify that such dolomite supplements are from non-ore regions of the world before ingesting them. Further, laboratory experiments conducted at the University of Alberta demonstrate that dolomite is practically insoluable in stomach acid and is eliminated from the body before significant magnesium or calcium can be absorbed. A far safer strategy is to avoid using dolomite as a supplement altogether, and instead taking equivalent amounts of milk of magnesia and calcium supplements. The chemical processes used to create such individual supplements effectively eliminate the risk of ingesting the toxic metals often associated with raw dolomite. A dietary supplement is intended to supply nutrients, (vitamins, minerals, fatty acids or amino acids) that are missing or not consumed in sufficient quantity in a persons diet. ... For other uses, see Calcium (disambiguation). ... General Name, symbol, number magnesium, Mg, 12 Chemical series alkaline earth metals Group, period, block 2, 3, s Appearance silvery white solid at room temp Standard atomic weight 24. ... Carbonate-hosted lead-zinc ore deposits are important and highly valuable concentrations of lead and zinc sulfide ores hosted within carbonate (limestone, marl, dolomite) formations and which share a common genetic origin. ... The Lead Belt is a lead mining district in the southeastern part of Missouri. ... Official language(s) English Capital Jefferson City Largest city Kansas City Largest metro area St Louis[1] Area  Ranked 21st  - Total 69,709 sq mi (180,693 km²)  - Width 240 miles (385 km)  - Length 300 miles (480 km)  - % water 1. ... This article is about the metal. ... Milk of Magnesia, or Magnesium Hydroxide, Mg(OH)2 is a saline osmotic (hydrating) laxative. ... For other uses, see Calcium (disambiguation). ...


See also

Gem animals. ... A sample of evaporite material Evaporites (IPA: ) are water-soluble, mineral sediments that result from the evaporation of bodies of surficial water. ...

References


  Results from FactBites:
 
Dolomites - Wikipedia, the free encyclopedia (474 words)
The Dolomites (in Italian, Alpi Dolomitiche) are a section of the Alps.
They are located in equal parts in the provinces of South Tyrol, Belluno and Trentino (all in northern Italy) and extend from the Adige river in the west to the Pieve valley (Pieve di Cadore) in the east.
The name "Dolomites" is derived from the famous French mineralogist Deodat de Dolomieu (1750 -1801) who was the first to describe the rock, Dolomite, a form of limestone which is responsible for the characteristic shapes of these great mountains.
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