igneous
Weathered feldspar-rich granite fragment
Granite, primarily quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pinkish-gray and brown, with visible translucent/white feldspar and dark mica; typically Mohs 6–7, vitreous to pearly luster, and no strong cleavage as a rock, though feldspar grains cleave.
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Physical properties
Coarse-grained, pinkish-gray and brown, with visible translucent/white feldspar and dark mica; typically Mohs 6–7, vitreous to pearly luster, and no strong cleavage as a rock, though feldspar grains cleave.
Formation & geological history
Intrusive igneous rock crystallized slowly from magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic mountain-building events; the fragment appears naturally weathered or broken.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and decorative stone; ordinary fragments have negligible commercial value.
Geological facts
Granite’s interlocking crystals reflect slow underground cooling. Orange-brown surfaces commonly result from iron oxidation and weathering of feldspar or mica.
Field identification & locations
Identify it by its coarse interlocking grains, pink/white feldspar, gray quartz, and black mica; distinguish it from sandstone by its crystalline texture and lack of rounded cemented grains. Common worldwide in continental crust and exposed mountain regions.
