igneous
Pink granite (likely weathered granite or granitic gneiss)
Granite; chiefly quartz (SiO₂), feldspar, and biotite/amphibole
AI-generated identification · may be incorrectCoarse, interlocking granular texture with pink potassium feldspar, gray-white quartz, and dark mica/amphibole; typically Mohs 6–7, vitreous to dull luster, no regular cleavage as a rock, and specific gravity about 2.6–2.7.
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Physical properties
Coarse, interlocking granular texture with pink potassium feldspar, gray-white quartz, and dark mica/amphibole; typically Mohs 6–7, vitreous to dull luster, no regular cleavage as a rock, and specific gravity about 2.6–2.7.
Formation & geological history
An intrusive felsic igneous rock formed by slow crystallization of silica-rich magma deep in Earth’s crust, commonly Precambrian to Mesozoic in age; the rounded surface indicates natural weathering or water abrasion.
Uses & applications
Used extensively for countertops, monuments, building stone, aggregate, landscaping, and decorative carvings; this hand specimen has modest collecting value.
Geological facts
Pink coloration usually comes from potassium feldspar, while dark grains are biotite or hornblende. The specimen may show slight foliation, suggesting granitic gneiss rather than uniform granite.
Field identification & locations
Identify it by visible interlocking pink feldspar, gray quartz, and black minerals, with no vesicles or sedimentary layers; common in continental mountain belts and glacial or stream gravels.
