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How do I classify a rock?

Rock Classification

Rocks are classified based on composition (which will affect the color - is it a dark-colored rock? a light-colored rock?) and texture (size and arrangement of mineral grains that make up the rock - can you see individual minerals? are the minerals deformed?).

When classifying rocks, first decide whether it's igneous, metamorphic, or sedimentary. Then classify it according to composition and texture to find the actual rock name.

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