igneous
Tumbled granite pebble (probable)
Granite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectSmall rounded, polished pebble with a cream/tan groundmass and black mineral flecks, likely biotite or hornblende. Granite has Mohs hardness about 6–7, vitreous to dull luster, interlocking coarse crystals, and no consistent cleavage as a rock.
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Physical properties
Small rounded, polished pebble with a cream/tan groundmass and black mineral flecks, likely biotite or hornblende. Granite has Mohs hardness about 6–7, vitreous to dull luster, interlocking coarse crystals, and no consistent cleavage as a rock.
Formation & geological history
Intrusive igneous rock formed by slow cooling of silica-rich magma, commonly during Precambrian to Phanerozoic continental crust formation; the rounded shape indicates abrasion and/or tumbling.
Uses & applications
Used as decorative aggregate, countertops, monuments, landscaping stone, and inexpensive collectible or craft material.
Geological facts
The visible dark grains are commonly biotite mica or amphibole, while pale grains are feldspar and quartz. Exact identification is limited by the small, low-resolution image.
Field identification & locations
Look for a speckled, interlocking texture rather than layers or pores; quartz is typically translucent/glassy, feldspar opaque, and mica may show reflective flakes. Common worldwide, especially in continental shields and mountain belts.
