igneous
Weathered granite fragment
Granite, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, mottled gray, white, and orange-brown; typically Mohs 6–7, with vitreous quartz, feldspar cleavage, and granular texture. The brown coloration likely reflects iron-oxide weathering.
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Physical properties
Coarse-grained, mottled gray, white, and orange-brown; typically Mohs 6–7, with vitreous quartz, feldspar cleavage, and granular texture. The brown coloration likely reflects iron-oxide weathering.
Formation & geological history
Granite is an intrusive igneous rock formed by slow crystallization of silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events. This fragment has been mechanically weathered from an exposed granite body.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and paving; this small weathered piece has negligible commercial or jewelry value.
Geological facts
The interlocking crystals distinguish granite from sedimentary rock and many volcanic rocks. Orange patches commonly develop when iron-bearing minerals or feldspar alter to iron oxides and clay minerals.
Field identification & locations
Identify it by visible interlocking quartz and feldspar grains, lack of layering, and hardness sufficient to scratch glass; a hand lens helps confirm the texture. Granite is widespread in continental shields and mountain belts worldwide.
