igneous
Quartz-rich granite or granitic pegmatite
Granite; chiefly quartz (SiO₂), potassium feldspar and plagioclase, with minor mica/iron oxides
AI-generated identification · may be incorrectCoarse-grained, pale pink to tan, granular texture with vitreous quartz and blocky feldspar; Mohs hardness about 6–7, nonmetallic luster, negligible cleavage as a whole, and specific gravity roughly 2.6–2.7.
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Physical properties
Coarse-grained, pale pink to tan, granular texture with vitreous quartz and blocky feldspar; Mohs hardness about 6–7, nonmetallic luster, negligible cleavage as a whole, and specific gravity roughly 2.6–2.7.
Formation & geological history
Slow cooling of silica-rich magma deep in the crust produced interlocking crystals, typically during Precambrian to younger continental mountain-building events; surface weathering rounded this specimen.
Uses & applications
Used extensively as dimension stone, countertops, paving, monuments and aggregate; attractive pieces are collected but usually have modest value.
Geological facts
The pink coloration commonly comes from potassium feldspar, while translucent gray areas are quartz; iron staining may produce the rusty tones.
Field identification & locations
Common in continental shields, mountain belts and granite quarries worldwide. Identify it by its visible interlocking quartz–feldspar grains and inability to scratch with a steel knife; exact classification is limited by the image.
