The Mineral Dolomite

biotite mineral

The mineral Dolomite is an anhydrous carbonate that has calcium- magnesium –carbonate. Dolomite also helps to identify carbonate rock at the sediment level that comprises of Dolomite, referred to also as dolostone

Chemical Formula

(Ca, Mg) (CO3) 2

Derivation of Name

In all likelihood Carl Linnaeus first explained the mineral during 1768. In 1791. Déodat Gratet de Dolomieu (1750–1801), French naturalist and geologist, initially described it as a rock from buildings of the old Roman City, and subsequently as specimens gathered from the Dolomite Alps located in northern Italy.


New research tells us that the contemporary dolomite formation occurs in highly saturated saltwater lagoons, mainly in Lagoa Vermelha and Brejo do Espinho, along Brasil’s Rio De Janeiro coast in anaerobic conditions. It is believed that “Desulfovibrio brasiliensis” or the sulfate-reducing bacteria generally help in the formation of Dolomite. However, potential new research on dolomite formation at low-temperature shows that it could happen in natural surroundings loaded with microbial cell surfaces and organic matter.. This process is a consequence of carboxyl groups that account for magnesium complexation by association with the organic matter.


Dolomite’s uses are varied, such as

  • As ornamental stones production from magnesium in the Pidgeon process

  • A source for obtaining magnesium oxide

  • In concrete aggregation.

  • This essential rock which acts as a reservoir for petroleum

  • Dolomite acts as a host rock in ore deposits of the base metals like copper, zinc and lead, in the huge strata-bound Mississippi Valley – Type (MVT).


  • The prominent locations where Dolomite occurs, are the renowned Midwestern quarries of the USA; Switzerland; Pamplona, in Spain, Ontario in Canada and Mexico


Dolomite typically forms rhombohedrons crystals. However, somehow, probably due to twinning, some crystals get curved into a saddle shape. These crystals signify a distinctive crystal habit that is renowned as Classical Dolomite. All crystals are not curved and some notable specimens show well formed, sharp rhombohedrons. The shine of dolomite is inimitable and is perhaps the best graphic of a pearly luster.


Color is regularly pink or pinkish or may be white, colorless, gray, yellow or even black or brown, if crystal contains iron.


2.876 g/cm3

Mohs Scale Hardness is