igneous
Weathered granite or granitic gneiss
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale pink-gray rock with visible quartz/feldspar and dark mica or biotite; typically Mohs 6–7, vitreous-to-dull luster, granular texture, and no prominent cleavage as a whole. The rounded surface indicates substantial weathering or abrasion.
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Physical properties
Coarse-grained, pale pink-gray rock with visible quartz/feldspar and dark mica or biotite; typically Mohs 6–7, vitreous-to-dull luster, granular texture, and no prominent cleavage as a whole. The rounded surface indicates substantial weathering or abrasion.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events; gneissic banding, if present, reflects later metamorphism. Exact age and identification require a fresh surface or laboratory testing.
Uses & applications
Used as dimension stone, countertops, monuments, aggregate, and landscaping rock; ordinary rounded specimens have little jewelry value.
Geological facts
Pink coloration commonly comes from potassium feldspar, while gray translucent grains are quartz and dark flecks are biotite or amphibole. Granitic rocks commonly weather into rounded “corestones” in soil and bedrock landscapes.
Field identification & locations
Identify it by its interlocking visible grains and pink-white-gray color; a streak, hardness test, and inspection of a broken face help distinguish it from sandstone or concrete. Common worldwide, especially in continental shields and mountain belts.
