igneous
Weathered granite or granitic gneiss
Granite; primarily quartz (SiO₂), feldspar, and mica, possibly with metamorphic foliation
AI-generated identification · may be incorrectCoarse-grained, pale gray to pink and tan, with visible quartz and feldspar plus dark mica; vitreous quartz and feldspar luster, Mohs hardness about 6–7, no consistent cleavage as a whole, and specific gravity around 2.6–2.7.
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Physical properties
Coarse-grained, pale gray to pink and tan, with visible quartz and feldspar plus dark mica; vitreous quartz and feldspar luster, Mohs hardness about 6–7, no consistent cleavage as a whole, and specific gravity around 2.6–2.7.
Formation & geological history
Formed from slowly cooled silica-rich magma deep underground, likely hundreds of millions to billions of years old; surface weathering has roughened and stained the specimen with iron oxides.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and decorative material; attractive pieces are collected but this rough fragment has modest commercial value.
Geological facts
The pink, cream, and gray areas reflect different feldspar, quartz, and mica grains; rusty orange patches commonly result from oxidation of iron-bearing minerals.
Field identification & locations
Identify it by interlocking visible grains, glassy gray quartz, blocky pink/white feldspar, and scattered dark mica. Common in continental mountain belts and glacial deposits; estimated value is $1–$10 for a common hand specimen, or $10–$30 if unusually attractive.
