igneous
Coarse-grained granite (probable)
Granite, a quartz–feldspar–mica intrusive igneous rock
AI-generated identification · may be incorrectVisible interlocking, pale feldspar/quartz and dark mica-like grains; uneven granular texture. Typical granite has Mohs hardness 6–7, vitreous quartz, and no dominant cleavage; exact minerals are uncertain from the photo.
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Physical properties
Visible interlocking, pale feldspar/quartz and dark mica-like grains; uneven granular texture. Typical granite has Mohs hardness 6–7, vitreous quartz, and no dominant cleavage; exact minerals are uncertain from the photo.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep in the crust, allowing large crystals to form. Granite bodies occur across many geological ages; the specimen’s age and locality cannot be determined visually.
Uses & applications
Granite is widely used as dimension stone, paving, countertops, monuments, and aggregate; this rough hand specimen is mainly of collecting or educational interest.
Geological facts
The coarse texture reflects slow underground cooling. The dark grains may be biotite or amphibole, while the pale material is likely feldspar and quartz.
Field identification & locations
Look for interlocking light and dark crystals and a hard, scratch-resistant surface; confirm quartz by its glassy appearance and lack of cleavage. Similar rocks occur in continental crust worldwide.
