igneous
Granite
Coarse-grained felsic intrusive igneous rock; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectTypically Mohs 6–7; pinkish-tan, gray, and black speckled appearance, with a granular texture and vitreous quartz plus feldspar luster. Crystals are interlocking and show no preferred cleavage as a whole, though individual minerals may cleave.
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Physical properties
Typically Mohs 6–7; pinkish-tan, gray, and black speckled appearance, with a granular texture and vitreous quartz plus feldspar luster. Crystals are interlocking and show no preferred cleavage as a whole, though individual minerals may cleave.
Formation & geological history
Forms when silica-rich magma slowly cools underground, allowing visible crystals to grow; commonly Paleozoic to Precambrian in exposed continental crust, though granite occurs in rocks of many ages.
Uses & applications
Used as dimension stone, countertops, monuments, paving, aggregate, and decorative landscaping material; small attractive pieces are inexpensive collector specimens.
Geological facts
The specimen appears granite or a closely related granitic rock, possibly weathered and slightly rounded; pink coloration commonly reflects potassium feldspar.
Field identification & locations
Identify it by visible interlocking quartz and feldspar grains, pink/gray coloration, and hardness sufficient to scratch glass; common worldwide in mountain belts and continental shields.
