igneous
Granite fragment
Granite, chiefly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectSmall, rough, light gray-green, granular specimen with a dull to weakly vitreous luster; likely Mohs hardness 6–7, lacking obvious cleavage as a whole, with feldspar cleavage internally. The green tint may reflect weathering, chlorite, or epidote.
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Physical properties
Small, rough, light gray-green, granular specimen with a dull to weakly vitreous luster; likely Mohs hardness 6–7, lacking obvious cleavage as a whole, with feldspar cleavage internally. The green tint may reflect weathering, chlorite, or epidote.
Formation & geological history
Granite forms when silica-rich magma slowly crystallizes deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events; this fragment was likely weathered from an outcrop or gravel.
Uses & applications
Used extensively as dimension stone, crushed aggregate, monuments, countertops, and decorative landscaping material. This small ordinary fragment has negligible commercial value.
Geological facts
Visible interlocking grains and mixed pale minerals are typical of granite, though the image is not detailed enough to confirm the exact rock. It could also be a closely related granitic rock such as granodiorite.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts. Confirm with a hand lens: quartz is glassy and gray, feldspar is opaque and blocky, and mica appears as shiny flakes; a steel file should not easily scratch quartz.
