igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; mottled white, tan, and brown with a granular texture and vitreous quartz alongside feldspar and mica. Crystals are interlocking and visible; no rock-wide cleavage, though individual minerals may cleave.
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Physical properties
Hardness about 6–7 Mohs; mottled white, tan, and brown with a granular texture and vitreous quartz alongside feldspar and mica. Crystals are interlocking and visible; no rock-wide cleavage, though individual minerals may cleave.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing large crystals to grow. Granite occurs in continental crust and ranges from Archean to recent geological ages.
Uses & applications
Used as dimension stone, countertops, building cladding, paving, monuments, and crushed aggregate; attractive pieces are collected.
Geological facts
Granite’s color and texture vary with the proportions of quartz, feldspar, and dark minerals; weathering can leave iron-oxide brown staining.
Field identification & locations
The image appears consistent with weathered, coarse-grained granite, but a photo cannot confirm its mineral proportions. Look for interlocking light-colored grains and glassy quartz; common in continental mountain belts and ancient shields.
