igneous
Weathered granite fragment
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled gray-brown specimen with a dull to slightly vitreous luster; likely Mohs hardness 6–7, with uneven fracture and no obvious cleavage as a whole rock. Individual feldspar grains may show cleavage, while quartz is hard and glassy.
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Physical properties
Coarse-grained, mottled gray-brown specimen with a dull to slightly vitreous luster; likely Mohs hardness 6–7, with uneven fracture and no obvious cleavage as a whole rock. Individual feldspar grains may show cleavage, while quartz is hard and glassy.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Mesozoic plutonic events; the fragment appears weathered and possibly naturally broken.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and landscaping material; small pieces have minimal commercial or collector value.
Geological facts
The visible greenish-brown coloration may reflect weathered biotite or chlorite, iron staining, or a related granitic rock such as granodiorite. Exact identification requires a fresh surface or petrographic examination.
Field identification & locations
Look for interlocking visible quartz, feldspar, and dark mica grains; quartz should resist scratching by steel, whereas weathered feldspar may not. Granite is widespread in continental mountain belts and exposed plutons worldwide.
