igneous
Tumbled pink granite
Granite, chiefly quartz–feldspar–mica; commonly pink potassium feldspar with quartz and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, interlocking crystalline texture with pink, gray, and black patches; vitreous to dull luster, no cleavage as a rock, and typical mineral hardness of about 6–7 Mohs. Specific gravity is approximately 2.63–2.75.
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Physical properties
Coarse-grained, interlocking crystalline texture with pink, gray, and black patches; vitreous to dull luster, no cleavage as a rock, and typical mineral hardness of about 6–7 Mohs. Specific gravity is approximately 2.63–2.75.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep in continental crust, generally during Precambrian to younger continental intrusions; the rounded surface is human-tumbled and polished.
Uses & applications
Used as decorative stone, countertops, monuments, aggregate, landscaping, and inexpensive lapidary pieces; rarely valuable as jewelry.
Geological facts
The pink color usually comes from potassium feldspar, while dark streaks are biotite or hornblende. Its visible crystals indicate slow underground cooling rather than volcanic eruption.
Field identification & locations
Identify it by the mottled pink-gray-black appearance, randomly interlocking grains, and resistance to scratching; a steel knife typically leaves little or no mark. Common worldwide, especially in continental shield and batholith regions.
