igneous
Weathered granite fragment
Granite, chiefly quartz, alkali feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, pinkish-gray rock with visible interlocking crystals and dark mica; typically Mohs 6–7, glassy to dull luster, massive texture, and no cleavage as a whole. The reddish coloration likely reflects iron-oxidized feldspar or weathering.
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Physical properties
Coarse-grained, pinkish-gray rock with visible interlocking crystals and dark mica; typically Mohs 6–7, glassy to dull luster, massive texture, and no cleavage as a whole. The reddish coloration likely reflects iron-oxidized feldspar or weathering.
Formation & geological history
An intrusive igneous rock that crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic continental-plutonic events. The fragment appears naturally weathered or broken from a larger outcrop.
Uses & applications
Widely used as building stone, countertops, monuments, aggregate, and landscape rock; this small weathered piece has little commercial value.
Geological facts
Granite’s large crystals indicate slow underground cooling, unlike fine-grained volcanic rhyolite. Its exact identification could include related granitic rocks such as granodiorite or weathered pegmatitic granite.
Field identification & locations
Identify it by its visible pink feldspar, gray quartz, and black mica in a speckled texture; a streak test is usually uninformative, while quartz should scratch glass. Common worldwide in continental shields, mountain belts, and exposed plutons.
