• synonyms


[doh-luh-mahyt, dol-uh-]
  1. a very common mineral, calcium magnesium carbonate, CaMg(CO3)2, occurring in crystals and in masses.
  2. a rock consisting essentially or largely of this mineral.
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Origin of dolomite

1785–95; < French, named after D. de Dolom(ieu) (1750–1801), French mineralogist; see -ite1
Related formsdol·o·mit·ic [dol-uh-mit-ik] /ˌdɒl əˈmɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for dolomite

Historical Examples of dolomite

  • As a dolomite the stone is far more resistant than a purer limestone.

    History of Linn County Iowa

    Luther A. Brewer

  • Part of the Houses of Parliament at Westminster is built of dolomite.

  • He's got to stare down her throat, to watch where the dolomite lands.


    Charles Rumford Walker

  • There was a lot of dolomite and old fine cinder, very dusty, but not hot.


    Charles Rumford Walker

  • "All right," I said, and picked up a shovel from the dolomite pile.


    Charles Rumford Walker

British Dictionary definitions for dolomite


  1. a white mineral often tinted by impurities, found in sedimentary rocks and veins. It is used in the manufacture of cement and as a building stone (marble). Composition: calcium magnesium carbonate. Formula: CaMg(CO 3) 2 . Crystal structure: hexagonal (rhombohedral)
  2. a sedimentary rock resembling limestone but consisting principally of the mineral dolomite. It is an important source of magnesium and its compounds, and is used as a building material and refractory
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Derived Formsdolomitic (ˌdɒləˈmɪtɪk), adjective

Word Origin for dolomite

C18: named after Déodat de Dolomieu (1750–1801), French mineralogist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for dolomite


1794, named for French geologist Déodat De Gratet De Dolomieu (1750-1801) who described the rock in his study of the Alps (1791).

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Online Etymology Dictionary, © 2010 Douglas Harper

dolomite in Science


[dōlə-mīt′, dŏlə-mīt′]
  1. A gray, pink, or white rhombohedral mineral. Dolomite occurs in curved saddlelike crystals with a pearly to glassy luster. It is a common rock-forming mineral. Chemical formula: CaMg(CO3)2.
  2. A sedimentary rock containing more than 50 percent of the mineral dolomite by weight.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.