igneous
Weathered granite or granitic pebble
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectFine-to-medium granular, rounded by abrasion, with pale cream, pink, and rusty-brown weathering. Typical hardness is about 6–7 Mohs, vitreous to dull luster, interlocking crystalline texture, and no consistent cleavage as a whole; iron staining causes the reddish patches.
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Physical properties
Fine-to-medium granular, rounded by abrasion, with pale cream, pink, and rusty-brown weathering. Typical hardness is about 6–7 Mohs, vitreous to dull luster, interlocking crystalline texture, and no consistent cleavage as a whole; iron staining causes the reddish patches.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma, commonly during Precambrian to younger continental-crust events. The pebble was later released by weathering and rounded in a stream, beach, or glacial deposit.
Uses & applications
Granite is widely used as dimension stone, countertops, monuments, aggregate, and paving; a small weathered pebble has little practical or jewelry use.
Geological facts
Its visible color variation commonly reflects potassium feldspar, quartz, altered minerals, and surface oxidation rather than separate gemstone bands.
Field identification & locations
Look for interlocking grains and scattered translucent quartz with pink or white feldspar; a hand lens is useful because weathering may obscure the texture. Common worldwide, especially in streambeds and glacial deposits.
