igneous
Weathered granite (likely granitic rock)
Granite; primarily quartz, feldspar, and mica (variable composition)
AI-generated identification · may be incorrectCoarse, uneven crystalline texture with pale feldspar/quartz and dark mica or altered minerals; typically Mohs 6–7, vitreous-to-dull luster, with no consistent cleavage as a whole rock. The specimen appears strongly weathered and iron-stained.
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Physical properties
Coarse, uneven crystalline texture with pale feldspar/quartz and dark mica or altered minerals; typically Mohs 6–7, vitreous-to-dull luster, with no consistent cleavage as a whole rock. The specimen appears strongly weathered and iron-stained.
Formation & geological history
Intrusive igneous rock crystallized slowly from silica-rich magma deep in the continental crust, commonly during Precambrian to younger mountain-building events; surface weathering rounded and altered it.
Uses & applications
Used widely as dimension stone, countertops, monuments, aggregate, and decorative stone; this small weathered piece has mainly educational or modest collecting value.
Geological facts
Granite’s visible interlocking crystals record slow cooling underground. Orange-brown patches commonly result from oxidation of iron-bearing minerals or staining by iron oxides.
Field identification & locations
Identify it by its coarse interlocking grains, quartz-like gray translucent areas, pink/white feldspar, and scattered dark mica; distinguish it from gneiss by the lack of clear mineral banding. Common worldwide in continental shields and mountain ranges.
