igneous
Weathered granite (likely pink granite)
Granite; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, granular texture with pink feldspar, gray-white quartz, and dark mica/amphibole bands; vitreous quartz and feldspar luster, no obvious cleavage as a whole, Mohs hardness about 6–7, specific gravity roughly 2.63–2.75.
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Physical properties
Coarse-grained, granular texture with pink feldspar, gray-white quartz, and dark mica/amphibole bands; vitreous quartz and feldspar luster, no obvious cleavage as a whole, Mohs hardness about 6–7, specific gravity roughly 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in continental crust, commonly during Precambrian to younger continental mountain-building events. The rounded shape and softened surface indicate weathering and transport.
Uses & applications
Widely used as dimension stone, countertops, paving, monuments, aggregate, and landscaping rock; ordinary hand specimens have little commercial value.
Geological facts
Pink coloration usually reflects abundant potassium feldspar, while the dark streaks may be biotite-rich schlieren or weathered mafic minerals. Granite commonly develops rounded boulders through spheroidal weathering.
Field identification & locations
Identify it by visible interlocking crystals, pink or cream feldspar, translucent gray quartz, and scattered black minerals; it should scratch glass but not be scratched by a steel knife. Common worldwide, especially in continental shields and mountain belts.
