igneous
Mottled granite
Granite, a coarse-grained felsic intrusive igneous rock, composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectVisible interlocking light gray/white and tan feldspar with darker gray minerals; typically Mohs 6–7, vitreous quartz and feldspar luster, with no consistent cleavage in the rock as a whole. The image appears to show a flat, possibly cut or weathered surface.
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Physical properties
Visible interlocking light gray/white and tan feldspar with darker gray minerals; typically Mohs 6–7, vitreous quartz and feldspar luster, with no consistent cleavage in the rock as a whole. The image appears to show a flat, possibly cut or weathered surface.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing visible crystals to grow; granite bodies occur in rocks ranging from Archean to recent geologic time.
Uses & applications
Widely used as building and paving stone, countertops, monuments, and decorative facing; attractive pieces are collected or polished.
Geological facts
Granite’s color and texture vary with the proportions of quartz, feldspar, and dark minerals such as biotite or hornblende.
Field identification & locations
Identify it by its hard, speckled, interlocking crystals and lack of layering; common in continental mountain ranges and exposed shields worldwide. The image alone does not establish a specific variety or locality.
