igneous
Weathered granite pebble
Granite, composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled cream, tan, and dark minerals with a dull, weathered surface; likely Mohs hardness 6–7. Individual grains have different crystal structures, so cleavage and luster vary by mineral.
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Physical properties
Coarse-grained, mottled cream, tan, and dark minerals with a dull, weathered surface; likely Mohs hardness 6–7. Individual grains have different crystal structures, so cleavage and luster vary by mineral.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. The pebble was later exposed by erosion; its exact geological age cannot be determined from the image.
Uses & applications
Granite is widely used for building stone, paving, countertops, and aggregate; this small weathered pebble has little commercial value.
Geological facts
Quartz and feldspar make up most granite, while dark flecks are commonly mica or amphibole.
Field identification & locations
The speckled mixture of interlocking light and dark grains is characteristic; confirm with a hand lens, since the image alone cannot establish the rock type. Granite occurs worldwide in continental crust and river or beach gravels.
