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Published byHerbert Gibbs Modified over 9 years ago
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Mineral composition Color Texture
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Made from mixtures of minerals and other materials. Rock-forming minerals Contain several minerals (ex. Quartz, feldspar, hornblende, and mica)
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Provides clues to the rock’s mineral composition Example: granite is light-colored that has a high silica content. Silica- used in glassmaking activities and hydraulic fracturing
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Grains Tiny particles of minerals stuck together. Size ▪ larger grains = more coarse ▪ Smaller grains= fine
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GRAIN SHAPE Smooth vs. Jagged Depends of composition of rock
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GRAIN PATTERN Flat layers vs. Swirling
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