igneous
Likely quartz-rich granite or granitic pegmatite
Granite, composed chiefly of quartz (SiO₂), feldspar, and mica; identification from the image is approximate
AI-generated identification · may be incorrectCoarse, pale gray-white rock with visible sparkling grains and minor reddish-brown staining. Quartz hardness is 7 Mohs; feldspar is about 6, with a granular texture and no strong cleavage across the whole rock.
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Physical properties
Coarse, pale gray-white rock with visible sparkling grains and minor reddish-brown staining. Quartz hardness is 7 Mohs; feldspar is about 6, with a granular texture and no strong cleavage across the whole rock.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow; its precise geological age cannot be determined from appearance alone.
Uses & applications
Granite is widely used as building and paving stone, countertops, and decorative aggregate; this rough piece is mainly suitable for collecting or display.
Geological facts
The light color and interlocking visible grains are characteristic of felsic intrusive rocks, though the photo does not show enough detail for a firm identification.
Field identification & locations
Look for hard, glassy quartz grains alongside blocky feldspar and darker mica; common sources include continental mountain belts and exposed plutons worldwide.
