igneous
Granite-like granitic rock
Crystalline plutonic rock, primarily quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse crystalline, gray-green and speckled, with a granular texture and vitreous-to-dull luster; typical hardness is about 6–7 Mohs. Cleavage belongs to individual feldspar crystals rather than the whole rock; density is roughly 2.6–2.8 g/cm³.
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Physical properties
Coarse crystalline, gray-green and speckled, with a granular texture and vitreous-to-dull luster; typical hardness is about 6–7 Mohs. Cleavage belongs to individual feldspar crystals rather than the whole rock; density is roughly 2.6–2.8 g/cm³.
Formation & geological history
Likely an intrusive igneous rock formed when silica-rich magma cooled slowly deep underground, allowing visible crystals to grow. Its exact geological age cannot be determined from the photograph.
Uses & applications
Used for crushed aggregate, building stone, countertops, monuments, and decorative objects; this small unpolished piece has little commercial value.
Geological facts
The specimen appears granitic but could also be a related metamorphic rock such as gneiss; visible mineral grains are needed for confident identification.
Field identification & locations
Look for interlocking light feldspar and quartz grains with darker mica or amphibole, no layering, and a hard surface that resists a steel scratch. Common worldwide in continental crust and exposed mountain ranges.
