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; pale gray to pinkish-white with visible interlocking grains and a nonmetallic, mostly vitreous luster. Crystals are typically quartz, feldspar, and dark mica; no consistent cleavage at the rock scale.
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Physical properties
Hardness about 6–7 Mohs; pale gray to pinkish-white with visible interlocking grains and a nonmetallic, mostly vitreous luster. Crystals are typically quartz, feldspar, and dark mica; no consistent cleavage at the rock scale.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing large crystals to grow. Granite occurs in continental crust of many ages; the specimen’s age cannot be determined from the image.
Uses & applications
Used as dimension stone, countertops, paving, monuments, and aggregate; typical rough hand specimens have modest collector value.
Geological facts
The visible coarse, speckled texture is characteristic of slow cooling. The brown surface may reflect weathering or iron staining.
Field identification & locations
Look for interlocking light quartz and feldspar grains with scattered darker minerals; confirm with a fresh surface, since the image alone cannot distinguish granite from similar granitic rocks. Common worldwide in continental mountain belts and exposed shield regions.
