igneous
Unakite-like granite
Granite, likely a quartz–feldspar rock with dark mafic minerals; exact identification is uncertain from the small image
AI-generated identification · may be incorrectCoarse-grained, mottled pale gray-white and dark gray/black, with a dull to slightly vitreous luster. Granite typically has Mohs hardness 6–7, no cleavage as a rock, and specific gravity about 2.6–2.8; visible grains suggest interlocking quartz and feldspar crystals.
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Physical properties
Coarse-grained, mottled pale gray-white and dark gray/black, with a dull to slightly vitreous luster. Granite typically has Mohs hardness 6–7, no cleavage as a rock, and specific gravity about 2.6–2.8; visible grains suggest interlocking quartz and feldspar crystals.
Formation & geological history
Formed when silica-rich magma cooled slowly deep in the continental crust, allowing large crystals to grow; most granite is Precambrian to Phanerozoic in age. The specimen appears cut or broken rather than naturally weathered.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and small decorative or educational specimens. This small ordinary piece has little jewelry value.
Geological facts
The dark patches may be biotite, hornblende, or weathered mafic minerals; the image is insufficient to confirm whether it is true unakite, which contains conspicuous green epidote and pink feldspar.
Field identification & locations
Look for interlocking visible grains, abundant light feldspar/quartz, and scattered dark mica or amphibole; a glassy streak or uniform fine texture would suggest another material. Common worldwide, including India, Brazil, Scandinavia, and North America.
