A rock-forming hydrous aluminosilicate mineral with characteristic sheet structure and strong cleavage.
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Card 17
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The splitting of light into two rays by anisotropic materials, which causes characteristic colour schemes when observed in thin sections between crossed polarisers.
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Card 18
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Coarse grained clastic rock.
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Card 19
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A circular depression more than 1km across resulting from a volcanic eruption. Excavation may be mainly by explosive ejection or by collapse into the space left inside after magma has been erupted.
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Rich in carbon.
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Card 21
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Descriptor term to denote a distinctive area of broken-looking terrain.
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The formation of organic matter using chemical energy.
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Card 23
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Thin strands of clouds, named after the Latin word '___' for a ringlet or curling strand of hair.
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A rock formed from fragments of pre-existing rocks.
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Coming together of fragmented material, for example under its own gravity.
