igneous
Polished granite pebble
Granite, a coarse-grained plutonic rock composed chiefly of quartz, feldspar, and mica or other dark minerals
AI-generated identification · may be incorrectMottled light and dark grains with a granular texture and no obvious layering; typical granite hardness is about 6–7 Mohs. Individual mineral grains have different lusters and crystal structures; the pebble’s rounded shape indicates abrasion, not a distinct crystal form.
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Physical properties
Mottled light and dark grains with a granular texture and no obvious layering; typical granite hardness is about 6–7 Mohs. Individual mineral grains have different lusters and crystal structures; the pebble’s rounded shape indicates abrasion, not a distinct crystal form.
Formation & geological history
Formed as silica-rich magma cooled slowly underground, allowing visible crystals to grow; granite ranges from ancient Precambrian rocks to much younger intrusions. The pebble was later rounded by transport or tumbling.
Uses & applications
Granite is widely used for building stone, countertops, paving, and monuments; this small pebble is mainly decorative or collectible.
Geological facts
Granite’s visible grains are interlocking crystals, commonly including quartz and feldspar, with dark biotite or amphibole.
Field identification & locations
Identify it by its speckled, interlocking grains and lack of foliation; the exact minerals cannot be confirmed from the photo. Granite is common worldwide, especially in continental crust and mountain ranges.
