igneous
Rounded granite pebble
Granite, chiefly quartz, feldspar, and mica (variable composition)
AI-generated identification · may be incorrectCoarse-grained, speckled gray-and-white appearance with dark mica/amphibole; vitreous quartz and feldspar luster, massive texture, no obvious cleavage as a whole, Mohs hardness about 6–7, specific gravity roughly 2.6–2.7.
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Physical properties
Coarse-grained, speckled gray-and-white appearance with dark mica/amphibole; vitreous quartz and feldspar luster, massive texture, no obvious cleavage as a whole, Mohs hardness about 6–7, specific gravity roughly 2.6–2.7.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events; rounding indicates transport by water or weathering.
Uses & applications
Used as aggregate, building stone, paving, monuments, countertops, and decorative pebbles; this small common specimen has little commercial or jewelry value.
Geological facts
The visible grains are likely interlocking quartz, feldspar, and dark mica or amphibole. Its rounded form results from abrasion, while the light-dark speckling reflects its mineral mixture.
Field identification & locations
Common worldwide, especially in continental crust and granitic mountain regions. Identify it by its coarse interlocking grains and lack of layering; a glassy quartz grain and pink/white feldspar help distinguish it from fine-grained basalt.
