igneous
Weathered blue-speckled granite or granitic rock
Granite, likely quartz–feldspar–mica aggregate; blue grains may be sodic feldspar or altered minerals
AI-generated identification · may be incorrectCoarse, granular texture with pale feldspar/quartz, rusty-brown iron-oxide staining, and scattered blue-gray grains. Typical hardness is about 6–7 Mohs, nonmetallic luster, interlocking crystals, and no obvious cleavage as a whole rock.
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Physical properties
Coarse, granular texture with pale feldspar/quartz, rusty-brown iron-oxide staining, and scattered blue-gray grains. Typical hardness is about 6–7 Mohs, nonmetallic luster, interlocking crystals, and no obvious cleavage as a whole rock.
Formation & geological history
Formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic plutonic events; surface weathering produced the brown staining and softened edges.
Uses & applications
Used as dimension stone, countertops, aggregate, monuments, and landscaping material; this small weathered fragment has little practical or jewelry value.
Geological facts
The blue component could be sodic feldspar, quartz, or an alteration product; a definitive identification requires a fresh break, hand lens, streak, and possibly thin-section or chemical analysis.
Field identification & locations
Common in continental shields and granitic terrains worldwide, including India, Scandinavia, Canada, and the United States. Look for visible interlocking quartz, feldspar, and dark mica; likely value is $1–$10 as an ordinary specimen, or up to $20–$50 if unusually attractive or locality-labeled.
