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Sedimentary
Rocks
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Dolomite
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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 mineral and the rock have the same name). Detrital minerals and secondary silica (chert) may be present. Field relations: Dolomites are usually interbedded with other limestone s and are commonly associated salt and gypsium deposits. Most dolomites 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." (Hamilton et al 1976, 200) |
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Common
Sedimentary Rocks:
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Rock types:
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