igneous
Granite (likely weathered granite fragment)
Granite; mainly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale gray rock with visible dark mica or amphibole; glassy quartz and blocky feldspar, with no obvious foliation. Typical hardness is about 6–7 Mohs, nonmetallic luster, and high density around 2.6–2.8 g/cm³.
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Physical properties
Coarse-grained, pale gray rock with visible dark mica or amphibole; glassy quartz and blocky feldspar, with no obvious foliation. Typical hardness is about 6–7 Mohs, nonmetallic luster, and high density around 2.6–2.8 g/cm³.
Formation & geological history
Forms when silica-rich magma cools slowly deep underground, allowing large crystals to grow; most granite is Precambrian to Phanerozoic in age. The specimen appears naturally weathered or broken from an intrusive body.
Uses & applications
Widely used as building stone, countertops, monuments, aggregate, and decorative stone; small ordinary fragments have little commercial value.
Geological facts
Quartz is usually translucent or gray, feldspar is white to pink, and mica produces black or brown specks. Acid generally causes no reaction, distinguishing it from limestone.
Field identification & locations
Common worldwide in continental crust, including India, North America, Europe, and Africa. Identify by its interlocking visible grains and lack of layering; a definitive name requires a fresh surface or petrographic testing.
