igneous
Quartz-rich granite or pegmatitic rock
Granite/pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica
AI-generated identification · may be incorrectCoarse-grained, irregular pale pink, white, and gray mineral mixture with glassy quartz and pearly feldspar; hardness about 6–7 Mohs, nonmetallic luster, no prominent cleavage as a whole, and typical specific gravity 2.6–2.7.
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Physical properties
Coarse-grained, irregular pale pink, white, and gray mineral mixture with glassy quartz and pearly feldspar; hardness about 6–7 Mohs, nonmetallic luster, no prominent cleavage as a whole, and typical specific gravity 2.6–2.7.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep in the crust, producing interlocking crystals; exact geological age cannot be determined from the image and may range from Precambrian to younger intrusive bodies.
Uses & applications
Used as crushed stone, building and countertop material, and occasionally as a decorative or collecting specimen; this small piece has minimal commercial value.
Geological facts
Pink coloration commonly comes from potassium feldspar, while translucent grains are quartz. The coarse texture indicates slow cooling rather than volcanic eruption.
Field identification & locations
Common in continental plutons, pegmatite dikes, and glacial or stream gravels worldwide. Field identification relies on visible interlocking quartz, feldspar, and mica grains; acid testing and a hardness test can help distinguish it from limestone or soft rock.
