igneous
Likely weathered granite
Granite; mainly quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse, speckled pink-gray appearance with a granular texture, consistent with feldspar, quartz, and dark mica or amphibole. Typical hardness is about 6–7 Mohs, nonmetallic luster, massive texture, and no obvious cleavage at specimen scale.
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Physical properties
Coarse, speckled pink-gray appearance with a granular texture, consistent with feldspar, quartz, and dark mica or amphibole. Typical hardness is about 6–7 Mohs, nonmetallic luster, massive texture, and no obvious cleavage at specimen scale.
Formation & geological history
Granite forms when silica-rich magma cools slowly deep within continental crust, producing visible interlocking crystals; it is generally Precambrian to Phanerozoic in age depending on locality. The rounded shape and dull surface indicate weathering or transport.
Uses & applications
Commonly used as building stone, countertops, monuments, aggregate, and paving; attractive polished pieces are decorative but this specimen appears ordinary and unpolished.
Geological facts
The pink color most likely comes from potassium feldspar, while gray translucent grains are quartz and black grains are biotite or hornblende.
Field identification & locations
Identify it by its visible interlocking grains, pink feldspar, gray quartz, and dark minerals; it should not fizz with dilute hydrochloric acid. Common worldwide in continental mountain belts and exposed batholiths.
