igneous
Granite-like rock
Biotite-bearing granite or granodiorite
AI-generated identification · may be incorrectCoarse-grained, gray-green and speckled, with a dull to slightly vitreous luster; likely quartz, feldspar, and dark mica/amphibole. Mohs hardness about 6–7; poor cleavage as a rock, crystalline interlocking texture, and specific gravity roughly 2.6–2.8.
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Physical properties
Coarse-grained, gray-green and speckled, with a dull to slightly vitreous luster; likely quartz, feldspar, and dark mica/amphibole. Mohs hardness about 6–7; poor cleavage as a rock, crystalline interlocking texture, and specific gravity roughly 2.6–2.8.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic mountain-building events; exact age cannot be determined from the photograph.
Uses & applications
Used as crushed aggregate, building stone, countertops, monuments, and landscaping material; this small ordinary fragment has little jewelry or collector value.
Geological facts
The visible granular texture reflects crystals that grew slowly underground. A precise identification requires a fresh surface, hand lens, streak/cleavage observations, and ideally thin-section or chemical analysis.
Field identification & locations
Common worldwide, especially in continental mountain belts; likely locations include granite terrains in North America, Europe, Africa, and Asia. Look for distinct quartz, pale feldspar, and black mica grains; it should not fizz with dilute acid.
