igneous
Weathered granite or granitic rock
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale gray to whitish, with a dull to slightly sparkly luster; typical hardness is about 6–7 Mohs. Interlocking crystals and irregular fracture are likely, though the specimen is heavily weathered and identification is uncertain from the image.
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Physical properties
Coarse-grained, pale gray to whitish, with a dull to slightly sparkly luster; typical hardness is about 6–7 Mohs. Interlocking crystals and irregular fracture are likely, though the specimen is heavily weathered and identification is uncertain from the image.
Formation & geological history
An intrusive igneous rock crystallized slowly from magma deep underground, commonly during Precambrian to Phanerozoic mountain-building events. Surface exposure and weathering have weakened and stained the specimen.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and landscaping rock; this weathered fragment has little commercial value.
Geological facts
Granite commonly shows visible quartz and feldspar grains, sometimes with black mica or amphibole. Weathering can produce rounded surfaces and a crumbly, sandy coating.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts. Look for distinct interlocking light and dark mineral grains; a vinegar or acid test should not strongly fizz unless carbonate minerals are present.
