igneous
Weathered granitic rock fragment
Granite, likely quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectTypically Mohs 6–7; coarse-grained, speckled gray, white, and tan, with vitreous quartz, blocky feldspar, and dark mica/amphibole. The specimen appears rough and weathered; exact identification is limited by the image.
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Physical properties
Typically Mohs 6–7; coarse-grained, speckled gray, white, and tan, with vitreous quartz, blocky feldspar, and dark mica/amphibole. The specimen appears rough and weathered; exact identification is limited by the image.
Formation & geological history
Granite forms when silica-rich magma slowly crystallizes deep within continental crust, commonly during Precambrian to younger mountain-building events. Weathering and erosion produced this loose fragment.
Uses & applications
Used widely as dimension stone, countertops, monuments, aggregate, and landscaping rock; small fragments have modest collecting value.
Geological facts
Granite is not a single mineral but an intrusive igneous rock, commonly containing quartz, potassium feldspar, plagioclase, and biotite. Its visible interlocking grains indicate slow underground cooling.
Field identification & locations
Look for interlocking light-colored feldspar and quartz with scattered dark mica, no layering, and a hard surface that can scratch glass. Common worldwide, especially in continental shields and mountain belts.
