[ doh-luh-mahyt, dol-uh- ]
/ ˈdoʊ ləˌmaɪt, ˈdɒl ə- /


a very common mineral, calcium magnesium carbonate, CaMg(CO3)2, occurring in crystals and in masses.
a rock consisting essentially or largely of this mineral.

Origin of dolomite

1785–95; < French, named after D. de Dolom(ieu) (1750–1801), French mineralogist; see -ite1

Related forms

dol·o·mit·ic [dol-uh-mit-ik] /ˌdɒl əˈmɪt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for dolomite

British Dictionary definitions for dolomite


/ (ˈdɒləˌmaɪt) /


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)
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

Derived Forms

dolomitic (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

Science definitions for dolomite


[ dōlə-mīt′, dŏlə-mīt′ ]

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.
A sedimentary rock containing more than 50 percent of the mineral dolomite by weight.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.