igneous
Granite
Granite, a coarse-grained intrusive felsic igneous rock composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse, speckled gray-tan rock with visible interlocking mineral grains; typically Mohs 6–7, vitreous quartz and feldspar luster, no regular cleavage as a rock, and specific gravity around 2.6–2.7.
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Physical properties
Coarse, speckled gray-tan rock with visible interlocking mineral grains; typically Mohs 6–7, vitreous quartz and feldspar luster, no regular cleavage as a rock, and specific gravity around 2.6–2.7.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing large crystals to grow. Granite bodies occur in continental crust and range in age from Archean to geologically recent.
Uses & applications
Used for building stone, countertops, paving, monuments, and aggregate; attractive hand specimens are collected decoratively.
Geological facts
The foreground specimen appears granite-like, but the image alone cannot confirm its exact rock type or mineral proportions.
Field identification & locations
Look for visible interlocking grains, including glassy quartz and pale feldspar with darker mica or amphibole. Granite is widespread in continental mountain belts and shield regions worldwide.
