[doh-luh-mahyt, dol-uh-]
a very common mineral, calcium magnesium carbonate, CaMg(CO 3 ) 2 , occurring in crystals and in masses.
a rock consisting essentially or largely of this mineral.

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

dolomitic [dol-uh-mit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dolomite (ˈdɒləˌmaɪt)
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(CO3)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
[C18: named after Déodat de Dolomieu (1750--1801), French mineralogist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1794, named for Fr. geologist Déodat De Gratet De Dolomieu (1750-1801) who described the rock in his study of the Alps (1791).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
dolomite   (dō'lə-mīt', dŏl'ə-mīt')  Pronunciation Key 
  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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Karst is the geologic term for landscapes formed mainly by the dissolving of
  limestone or dolomite bedrock.
Generally, this rock is made of limestone or dolomite, both of which are easily
  dissolved by seeping groundwater.
The rhombic dolomite faces are often covered with a thin film of pyrobitumen.
Dolomite is not only harder than regular limestone, it also can't be dissolved
  by slightly acidic rainwater.
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