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Information @ a Glance

Introduction

  • Dolomite is the name of a sedimentary carbonate rock and a mineral, both composed of calcium magnesium carbonate CaMg(CO3)2 found in crystals.
  • Dolomite rock (also dolostone) is composed predominantly of the mineral dolomite.
  • 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 unless it is scratched or in powdered form.
  • Dolomite occurs in a different crystal class than the Calcite Group.

Formation

  • Dolomite is generally formed from limestone by dolomitisation, a diagenetic process involving replacement of calcium in the calcite with magnesium.
  • Limestone and dolomite are mined by opencast methods and sold either in bulk, powder or slurry form
  • Dolomite formed in relation to organic-rich marine sediments has been termed organogenic dolomite.
  • This type of dolomite is thought to be directly related to the diagenetic processes of sulfate reduction, methane oxidation, and methanogenesis

Uses

  • Dolomite is used as an ornamental stone, a concrete aggregate and as a source of magnesium oxide.
  • Dolomite is used to make magnesia, which has important medicinal applications.
  • Dolomite is used for manufacturing certain types of refractory bricks used in steel making.
  • Dolomite is also used in some cements, as a source of magnesium. Of course Dolomite is also used as mineral specimens.
  • It is also an important petroleum reservoir rock and a host rock for large strata-bound base metal (lead, zinc, copper) deposits.
  • Significant uses of mined limestone and dolomite in Pennsylvania include (1) crushed stone for roads, concrete, and railroads; (2) agricultural lime and grit; (3) the manufacture of cement; (4) fluxstone and refractory materials for the steel industry; (5) acid neutralization; (6) raw material for the glass industry; and (7) mineral fillers and whiting.

Report

  • Amongst the non-metallic minerals production in India, more than 90 percent of the aggregate value is shared by limestone, magnesite, dolomite, barytes, kaolin, gypsum, apatite & phosphorite, steatite and fluorite.
  • The bulk of dolomite in the world is used for aggregates. Though it is not economical, magnesium can be also extracted from dolomite. In the medical front, it is used for milk-of-magnesia preparation and there are also claims that it could be used as a magnesium supplement pills. In the oil industry, depending on its nature dolomite could either enhance or destroy petrochemical properties.
  • The dimension-stone market for all rock types is increasingly shifting away from imports of unprocessed rock blocks towards slabs and finished goods.
  • Slate, diabase, quartzite, and soapstone were quarriedin the Piedmont province; slate was the leading stone I type quarried, in terms of volume (cubic feet) and value.

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