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Definition: dolomite from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

In sedimentology, type of limestone rock where the calcite content is replaced by the mineral dolomite. Dolomite rock may be white, grey, brown, or reddish in colour, commonly crystalline. It is used as a building material. The region of the Alps known as the Dolomites is a fine example of dolomite formation.


Dolomite Mountains

Summary Article: Dolostone
From Guide to Minerals, Rocks and Fossils

Colour White, cream or grey, but often weathers brown or pinkish. Texture Coarse, medium or fine; compact, sometimes earthy. Structure Bedding tends to be large scale. May be massive or contain complex concretions and nodular growths. Conspicuously jointed. Organic remains usually destroyed by recrystallization. Mineralogy Contains a high proportion of dolomite (the name of the mineral and the old name for the rock are the same). Detrital minerals and secondary silica (chert) may be present. Field relations Dolostones are usually interbedded with other limestones and are commonly associated with salt and gypsum deposits. Most dolostones are thought to be of secondary (replacement) origin; the calcite of the original limestone having been replaced in situ by dolomite, probably by percolating watery solutions.

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