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Sedimentary Rocks


Dolomite


"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 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)

Common Sedimentary Rocks:
Breccia
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Sandstone
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Dolomite
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Rock types:
Igneous Rocks
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Sedimentary Rocks
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Metamorphic Rocks
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