igneous
Coarse-grained granite or granitic pegmatite fragment
Granite; primarily quartz, feldspar, and mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale gray to cream with darker specks, uneven granular texture, and mostly vitreous to dull luster. Interlocking crystals are visible, but the blurred image prevents confident identification of crystal sizes or exact minerals.
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Physical properties
Hardness about 6–7 Mohs; pale gray to cream with darker specks, uneven granular texture, and mostly vitreous to dull luster. Interlocking crystals are visible, but the blurred image prevents confident identification of crystal sizes or exact minerals.
Formation & geological history
Forms when silica-rich magma cools slowly underground, producing coarse crystals, commonly during Precambrian to Phanerozoic continental crust formation. The fragment likely came from weathered or broken intrusive bedrock.
Uses & applications
Used as building stone, aggregate, monuments, countertops, and decorative gravel; this small irregular piece has little commercial value. Collector value is generally negligible unless unusually attractive or locality-specific.
Geological facts
Granite is not a single mineral but an intrusive igneous rock; its light color reflects abundant quartz and feldspar. The specimen may alternatively be a quartz-rich metamorphic or pegmatitic rock.
Field identification & locations
Look for interlocking white/pink feldspar, gray translucent quartz, and black mica, with no layering or foliation; a glassy streak or acid reaction would suggest another material. Common worldwide, especially in continental mountain belts.
