igneous
Granite fragment
Granite; mainly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled white, gray, and tan material with vitreous to pearly mineral luster; typical Mohs hardness is 6–7, with no consistent cleavage at the whole-rock scale. The image is too small for precise mineral identification, but the interlocking grains resemble granite or a granitic pegmatite.
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Physical properties
Coarse-grained, speckled white, gray, and tan material with vitreous to pearly mineral luster; typical Mohs hardness is 6–7, with no consistent cleavage at the whole-rock scale. The image is too small for precise mineral identification, but the interlocking grains resemble granite or a granitic pegmatite.
Formation & geological history
Forms when silica-rich magma cools slowly deep underground, allowing visible crystals to grow; specimens may range from Precambrian to recent geologic ages. Common in continental crust and exposed mountain belts.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and decorative rock; small fragments have modest collecting value.
Geological facts
The pale grains are likely feldspar and quartz, while darker flakes may be biotite or hornblende. A true granite should show visibly interlocking crystals rather than cemented sedimentary grains.
Field identification & locations
Common worldwide, especially in India, Brazil, Canada, Scandinavia, and the United States. Identify it by its coarse interlocking texture; glassy quartz, blocky feldspar, and dark mica are useful field clues.
