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Metamorphic
Rocks
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2 slightly different types of quartzite
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2 slightly different types of quartzite |
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White, grey, reddish. Texture: Medium-grained; usually of a granoblastic texture. Structure: Usually massive but primary sedimentary features may be preserved, such as bedding, graded bedding or current bedding. Mineralogy: Essentially composed of tightly interlocking grains of quartz. A little feldspar or mica may also be evident. White varieties are distinguished from marble by their greater hardness. Field relations: Quartzites are metamorphosed quartz sandstones and are found in association with other metamorphosed sedimentary rocks such as phyllite, schist and marble." (Hamilton et al 1976, 148) |
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Common
Metamorphic Rocks:
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Rock types:
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