do·lo·mite

[doh-luh-mahyt, dol-uh-]
noun
1.
a very common mineral, calcium magnesium carbonate, CaMg(CO 3 ) 2 , occurring in crystals and in masses.
2.
a rock consisting essentially or largely of this mineral.
Origin:
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] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
dolomite (ˈdɒləˌmaɪt) [Click for IPA pronunciation guide]
 
—n
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]
 
dolomitic
 
—adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Dolomite is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Etymonline
Word Origin & History

dolomite
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
Many of the more durable hoodoos are capped with a special kind of
  magnesium-rich limestone called dolomite.
The rhombic dolomite faces are often covered with a thin film of pyrobitumen.
Karst is the geologic term for landscapes formed mainly by the dissolving of
  limestone or dolomite bedrock.
Shallow groundwater flows through a fractured dolomite aquifer.
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