igneous
Weathered granite or granitic gneiss
Granite; chiefly quartz, alkali feldspar, plagioclase, and minor mica
AI-generated identification · may be incorrectCoarse-grained, pale pink to tan, with a dull earthy luster from weathering; Mohs hardness about 6–7, no strong cleavage, and irregular fracture. The image suggests interlocking mineral grains, though its rounded surface obscures texture.
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Physical properties
Coarse-grained, pale pink to tan, with a dull earthy luster from weathering; Mohs hardness about 6–7, no strong cleavage, and irregular fracture. The image suggests interlocking mineral grains, though its rounded surface obscures texture.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep in the crust, typically during Precambrian to Phanerozoic continental plutonism; surface rounding results from weathering and abrasion.
Uses & applications
Widely used as dimension stone, countertops, monuments, aggregate, and paving; attractive polished pieces are also collected, though this specimen has little gem value.
Geological facts
Pink coloration commonly reflects potassium feldspar, while gray or glassy grains may be quartz. Weathered granite often develops rounded “corestones” through spheroidal weathering.
Field identification & locations
Look for visible interlocking quartz and feldspar grains, pink or gray coloration, and extreme resistance to scratching with a steel knife. Common worldwide, especially in continental mountain belts and exposed shield regions.
