igneous
Coarse-grained granite
Granite; mainly quartz (SiO₂), alkali feldspar/plagioclase feldspar, and mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pink, cream, gray, and black grains with a visible interlocking texture. Typically vitreous quartz, feldspar cleavage, no foliation, and specific gravity around 2.6–2.7.
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Physical properties
Hardness about 6–7 Mohs; pink, cream, gray, and black grains with a visible interlocking texture. Typically vitreous quartz, feldspar cleavage, no foliation, and specific gravity around 2.6–2.7.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma cooled slowly deep underground, allowing large crystals to grow. Most granite formed during Precambrian–Phanerozoic continental crust formation, though this specimen’s age cannot be determined visually.
Uses & applications
Widely used as building stone, countertops, monuments, paving, aggregate, and architectural facing; attractive pieces may be collected but are generally low-value.
Geological facts
The pink coloration commonly comes from potassium feldspar, while dark flakes are biotite or amphibole. Weathering can produce a rough, granular surface and rounded boulders.
Field identification & locations
Identify it by coarse, interlocking pink/white/gray crystals and the absence of layering; a hand lens can reveal translucent quartz and feldspar cleavage. Common worldwide in continental mountain belts, especially exposed batholiths.
