igneous
Red/pink granite or granitic gneiss
Felsic granitoid, chiefly quartz, potassium feldspar, plagioclase, and biotite; exact identification is uncertain from the image
AI-generated identification · may be incorrectCoarse-grained, pinkish-red and gray, with a granular texture and dull to slightly vitreous luster. Typical granite hardness is about 6–7 Mohs; crystals are interlocking and lack prominent cleavage as a whole.
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Physical properties
Coarse-grained, pinkish-red and gray, with a granular texture and dull to slightly vitreous luster. Typical granite hardness is about 6–7 Mohs; crystals are interlocking and lack prominent cleavage as a whole.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic continental mountain-building; pieces may show mild weathering or alteration.
Uses & applications
Used as crushed stone, aggregate, building stone, countertops, monuments, and landscaping material; attractive specimens have modest collector interest.
Geological facts
The pink color commonly comes from potassium feldspar, while dark flecks are usually biotite or hornblende. If foliation or banding is present, the material may instead be granitic gneiss, a metamorphic equivalent.
Field identification & locations
Look for visible interlocking quartz and feldspar grains, pink feldspar, and scattered dark mica; granite does not fizz with dilute acid and is much harder than steel. Common worldwide, especially in continental shields and mountain belts.
