igneous
Granite or granitic rock fragment
Coarse-grained felsic plutonic rock; mainly quartz, feldspar, and mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; mottled gray-brown appearance with visible interlocking grains and a dull to glassy luster. Massive texture, no obvious cleavage as a whole, and typically high density around 2.6–2.7 g/cm³.
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Physical properties
Hardness about 6–7 Mohs; mottled gray-brown appearance with visible interlocking grains and a dull to glassy luster. Massive texture, no obvious cleavage as a whole, and typically high density around 2.6–2.7 g/cm³.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, likely during Precambrian to Phanerozoic continental crust formation; the specific age cannot be determined from the image.
Uses & applications
Used widely as crushed aggregate, building stone, countertops, monuments, and landscaping material; small natural fragments have modest collecting value.
Geological facts
The visible speckled texture reflects crystals large enough to see without magnification, distinguishing it from volcanic rhyolite. Brown coloration may result from weathered biotite, iron staining, or feldspar alteration.
Field identification & locations
Identify it by visible quartz-like translucent grains, pale feldspar, and dark mica in an interlocking granular texture; a fresh broken surface is more diagnostic than the weathered exterior. Common worldwide in continental mountain belts and exposed batholiths.
