igneous
Pink granite (rounded cobble)
Granite, chiefly quartz, feldspar, and mica; pink coloration commonly from potassium feldspar
AI-generated identification · may be incorrectTypically Mohs 6–7, salmon-pink to cream with scattered grains, vitreous to dull luster, and granular interlocking crystals; no cleavage as a whole, though feldspar has cleavage. The image shows a weathered, water-rounded cobble with fine-to-medium texture.
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Physical properties
Typically Mohs 6–7, salmon-pink to cream with scattered grains, vitreous to dull luster, and granular interlocking crystals; no cleavage as a whole, though feldspar has cleavage. The image shows a weathered, water-rounded cobble with fine-to-medium texture.
Formation & geological history
Intrusive igneous rock crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to younger continental plutonism; later erosion rounded it. Exact age and source cannot be determined from the photograph.
Uses & applications
Used for building stone, countertops, paving, monuments, aggregate, landscaping, and decorative stone; generally not gem-quality.
Geological facts
Pink granite is often dominated by potassium feldspar, with quartz and minor biotite or hornblende. Its granular texture reflects slow underground cooling.
Field identification & locations
Identify it by visible interlocking pink feldspar, gray or glassy quartz, and dark mica; a knife should not scratch it easily, while quartz may scratch glass. Common in continental shield regions, granite quarries, glacial deposits, and stream gravels.
