igneous
Quartz-rich granite or granitic gneiss
Granite; chiefly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, tan-pink and gray, with visible sparkling quartz/feldspar and dark mica; typically Mohs 6–7, vitreous quartz luster, interlocking crystals, and no prominent cleavage as a whole rock. The image is slightly blurred, so exact identification is limited.
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Physical properties
Coarse-grained, tan-pink and gray, with visible sparkling quartz/feldspar and dark mica; typically Mohs 6–7, vitreous quartz luster, interlocking crystals, and no prominent cleavage as a whole rock. The image is slightly blurred, so exact identification is limited.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep in the continental crust, commonly during Precambrian to Phanerozoic plutonic events; foliation would suggest metamorphosed granite (gneiss).
Uses & applications
Widely used as dimension stone, countertops, monuments, aggregate, and landscaping rock; attractive pieces are collected but usually have low specimen value.
Geological facts
Pink coloration commonly comes from potassium feldspar, while glassy grains are quartz and reflective flakes are mica.
Field identification & locations
Identify by coarse interlocking grains, abundant quartz, pink/white feldspar, and scattered black or silvery mica; common in continental mountain belts worldwide. A fresh surface and hardness testing help distinguish it from sandstone.
