igneous
Weathered granite
Granite, composed mainly of quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectCoarse-grained, mottled tan, cream, and black; visible interlocking crystals and no obvious layering. Hardness is typically about 6–7 Mohs; mineral grains have differing lusters and cleavage.
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Physical properties
Coarse-grained, mottled tan, cream, and black; visible interlocking crystals and no obvious layering. Hardness is typically about 6–7 Mohs; mineral grains have differing lusters and cleavage.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing large crystals to grow. Its age cannot be determined from the image; granites occur in continental crust of many geological ages.
Uses & applications
Commonly used as building and paving stone, aggregate, countertops, and decorative stone; this small rough fragment is mainly suitable for collecting.
Geological facts
The pale grains are likely feldspar and quartz, while black grains may be biotite mica or hornblende; weathering can give exposed surfaces a rusty-brown tint.
Field identification & locations
Look for coarse, interlocking light and dark crystals, a hard non-layered texture, and grains that do not fizz with dilute acid. Granite is widespread in continental mountain belts and exposed bedrock.
