igneous
Coarse-grained granite (likely biotite granite)
Granite, composed mainly of quartz and feldspar with dark biotite or amphibole
AI-generated identification · may be incorrectLight gray, coarse and crystalline, with visible pale quartz/feldspar and dark mineral grains. Typical hardness is about 6–7 Mohs; granite has no consistent cleavage and a granular texture.
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Physical properties
Light gray, coarse and crystalline, with visible pale quartz/feldspar and dark mineral grains. Typical hardness is about 6–7 Mohs; granite has no consistent cleavage and a granular texture.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing large crystals to grow. Its exact geological age and source cannot be determined from the photo.
Uses & applications
Commonly used as building and paving stone, countertops, monuments, and decorative or educational specimens.
Geological facts
Granite is an intrusive igneous rock; its interlocking crystals make it strong and resistant to abrasion and weathering.
Field identification & locations
Look for interlocking visible crystals, pale quartz and feldspar, and scattered dark minerals; this specimen’s identification is visual and not definitive. Granite occurs widely in continental crust worldwide.
