igneous
Rounded granitic pebble
Granite, chiefly quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse-grained, pale gray to greenish-gray, with visible translucent quartz and light feldspar; generally Mohs 6–7, vitreous to dull luster, no cleavage as a rock, and specific gravity about 2.6–2.7. Its rounded shape and smoothed surface indicate water or sediment abrasion.
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Physical properties
Coarse-grained, pale gray to greenish-gray, with visible translucent quartz and light feldspar; generally Mohs 6–7, vitreous to dull luster, no cleavage as a rock, and specific gravity about 2.6–2.7. Its rounded shape and smoothed surface indicate water or sediment abrasion.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, commonly millions to billions of years ago; later weathering and erosion produced this pebble. The green tint may reflect altered feldspar, chlorite, or other secondary minerals.
Uses & applications
Common granite is used as crushed aggregate, dimension stone, paving, countertops, and monuments; this small specimen has mainly educational or modest collector value.
Geological facts
Granite’s interlocking crystals make it durable and resistant to abrasion. The image may also represent a closely related granitic or feldspathic rock, since exact identification requires a fresh surface or tests.
Field identification & locations
Look for interlocking quartz, feldspar, and dark mica crystals rather than a uniform texture; a glassy quartz grain and hardness near 6–7 support identification. Granitic pebbles occur widely in streams, beaches, glacial deposits, and weathered mountain terrains.
