igneous
Coarse-grained granite
Granite; predominantly quartz, feldspar, and mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; mottled pink, white, gray, and black with a granular texture and vitreous to dull luster. Interlocking crystals are visible; cleavage occurs in feldspar, while quartz has none.
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Physical properties
Hardness about 6–7 Mohs; mottled pink, white, gray, and black with a granular texture and vitreous to dull luster. Interlocking crystals are visible; cleavage occurs in feldspar, while quartz has none.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma cooled slowly deep within Earth, allowing large crystals to grow. Most granite formed during Precambrian or Phanerozoic continental crust development.
Uses & applications
Widely used for countertops, monuments, building stone, paving, and crushed aggregate; collectible value is generally low unless unusually attractive or from a notable locality.
Geological facts
The specimen appears granite-like, though the image is not sufficient to distinguish it confidently from granodiorite or a feldspar-rich pegmatitic rock.
Field identification & locations
Common worldwide, especially in continental mountain belts and exposed batholiths. Identify it by visible interlocking quartz, feldspar, and dark mica; a glassy quartz grain and abundant feldspar are typical clues.
