igneous
Weathered granite fragment
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse granular texture with tan/pink feldspar, translucent gray quartz, and dark mica; typically Mohs 6–7, vitreous to dull luster, no consistent cleavage as a rock, and specific gravity about 2.6–2.7.
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Physical properties
Coarse granular texture with tan/pink feldspar, translucent gray quartz, and dark mica; typically Mohs 6–7, vitreous to dull luster, no consistent cleavage as a rock, and specific gravity about 2.6–2.7.
Formation & geological history
An intrusive igneous rock formed by slow crystallization of silica-rich magma deep underground, generally during Precambrian to Phanerozoic mountain-building events; the rounded fragment reflects weathering or tumbling.
Uses & applications
Commonly used as building stone, countertops, monuments, aggregate, and landscaping material; small unattractive fragments have minimal jewelry or collector use.
Geological facts
The visible speckled appearance results from interlocking crystals that cooled too slowly to form glass. Pink coloration commonly comes from potassium feldspar, while dark grains are biotite or hornblende.
Field identification & locations
Identify it by its coarse interlocking crystals and mixed pink, gray, white, and black grains; distinguish it from rhyolite by the lack of a fine-grained matrix. Common worldwide, especially in continental shields and mountain belts.
