igneous
Pink granite (weathered, possibly pegmatitic)
Felsic intrusive igneous rock; chiefly quartz, potassium feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectCoarse, crystalline, pink-gray mottled texture with glassy quartz and pale/pink feldspar; 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, crystalline, pink-gray mottled texture with glassy quartz and pale/pink feldspar; 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
Formed when silica-rich magma slowly crystallized deep in Earth’s crust, commonly during Precambrian to Phanerozoic plutonic events; surface weathering has roughened and stained this specimen.
Uses & applications
Used as building stone, countertops, monuments, aggregate, and landscape rock; attractive pieces are collected but generally have modest value.
Geological facts
The pink color usually comes from iron-bearing potassium feldspar, while gray translucent grains are quartz. It may be pegmatitic if unusually large crystals occur, though the photograph suggests mostly typical granite.
Field identification & locations
Identify it by interlocking visible crystals, abundant pink feldspar, gray quartz, and dark mica/amphibole; unlike sandstone, it lacks layered grains. Common worldwide in continental shields and mountain plutons, including India, Brazil, Canada, and the United States.
