igneous
Weathered granite
Granite, chiefly quartz and feldspar with dark mica or amphibole
AI-generated identification · may be incorrectCoarse, speckled tan-and-dark appearance; typically Mohs 6–7, vitreous quartz and feldspar luster, interlocking crystals, and no consistent cleavage as a whole rock. The photograph does not resolve individual grains well enough to confirm the identification.
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Physical properties
Coarse, speckled tan-and-dark appearance; typically Mohs 6–7, vitreous quartz and feldspar luster, interlocking crystals, and no consistent cleavage as a whole rock. The photograph does not resolve individual grains well enough to confirm the identification.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing crystals to grow; it occurs in continental crust of many geological ages.
Uses & applications
Commonly used as building and paving stone, aggregate, monuments, and decorative stone; this rough specimen is mainly suitable for collecting or display.
Geological facts
The dark patches may be mafic minerals or weathering, but cannot be identified reliably from the image alone.
Field identification & locations
A granite-like, speckled texture supports this identification; look for visible quartz and feldspar crystals and test for hardness. Granite occurs widely in continental mountain belts and ancient shields.
