igneous
Granite (likely a granitic rock)
Granite, composed chiefly of quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectCoarse, speckled black-and-light appearance; interlocking crystals with no visible layering. Typical minerals are Mohs 6–7, with vitreous quartz and feldspar luster; exact mineral proportions and density cannot be confirmed from the image.
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Physical properties
Coarse, speckled black-and-light appearance; interlocking crystals with no visible layering. Typical minerals are Mohs 6–7, with vitreous quartz and feldspar luster; exact mineral proportions and density cannot be confirmed from the image.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing large crystals to grow. Its age depends on the source formation and cannot be determined from appearance alone.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and decorative aggregate; this rounded specimen is mainly suitable for collecting or display.
Geological facts
The rounded shape likely reflects natural abrasion during transport, while the coarse contrasting grains indicate slow cooling at depth.
Field identification & locations
Look for interlocking light feldspar/quartz grains and dark biotite or hornblende; granite is common in continental crust worldwide. A loose, palm-sized specimen typically sells for about $1–$15.
