[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.

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