igneous
Granite (likely weathered, pegmatitic granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, pink-and-white rock with dark green-black mica or amphibole; vitreous quartz and feldspar luster, interlocking crystals, no layering, and poor cleavage as a whole. Typical hardness is about 6–7 Mohs and specific gravity 2.63–2.75.
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Physical properties
Coarse-grained, pink-and-white rock with dark green-black mica or amphibole; vitreous quartz and feldspar luster, interlocking crystals, no layering, and poor cleavage as a whole. Typical hardness is about 6–7 Mohs and specific gravity 2.63–2.75.
Formation & geological history
An intrusive felsic igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events. The rounded surface indicates weathering or tumbling.
Uses & applications
Widely used for building stone, countertops, monuments, paving, aggregate, and architectural slabs; attractive pieces are collected but generally have little gem value.
Geological facts
Pink coloration commonly comes from potassium feldspar, while greenish patches may reflect epidote, chlorite, or altered amphibole. Granite is identified by visible interlocking crystals rather than sedimentary grains or foliation.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts; notable sources include India, Brazil, Scandinavia, Canada, and the United States. A hand lens and streak/acid tests help distinguish it from gneiss, which shows compositional banding.
