igneous
Pink granite or granitic gneiss
Granite; mainly quartz, alkali feldspar, plagioclase, and minor mica
AI-generated identification · may be incorrectCoarse crystalline, pink-gray, nonmetallic luster, with visible interlocking grains; quartz and feldspar are Mohs 6–7, and the rock has no obvious cleavage as a whole. The weak streaking or foliation may indicate granitic gneiss rather than ordinary granite.
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Physical properties
Coarse crystalline, pink-gray, nonmetallic luster, with visible interlocking grains; quartz and feldspar are Mohs 6–7, and the rock has no obvious cleavage as a whole. The weak streaking or foliation may indicate granitic gneiss rather than ordinary granite.
Formation & geological history
Formed by slow cooling of silica-rich magma deep underground, commonly during Precambrian to Phanerozoic mountain-building events; gneissic varieties were later altered by high-grade metamorphism. Exact age and origin cannot be determined from the photograph.
Uses & applications
Used as crushed stone, aggregate, building stone, countertops, monuments, and landscaping material; this rounded specimen is mainly suitable for collecting. Common pieces have little commercial value.
Geological facts
Pink coloration typically comes from potassium feldspar, while darker flecks are biotite or amphibole and translucent grains may be quartz. Weathering has rounded the surface and obscured some textures.
Field identification & locations
Look for interlocking pink feldspar, gray or glassy quartz, and scattered dark mica; visible banding favors gneiss. Common worldwide in continental shields and mountain belts, including the United States, Canada, Scandinavia, and India.
