igneous
Tumbled pink granite
Granite; predominantly quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled pink, white, gray, and black with a vitreous-to-dull luster; hardness about 6–7 Mohs, no consistent cleavage as a whole, and specific gravity around 2.6–2.7.
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Physical properties
Coarse-grained, speckled pink, white, gray, and black with a vitreous-to-dull luster; hardness about 6–7 Mohs, no consistent cleavage as a whole, and specific gravity around 2.6–2.7.
Formation & geological history
An intrusive felsic igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic mountain-building events. The rounded shape is human-tumbled and polished.
Uses & applications
Used widely for countertops, monuments, building stone, paving, and aggregate; attractive tumbled pieces are sold for decor, crafts, and beginner geology collections.
Geological facts
The pink color generally comes from potassium feldspar, while black flecks are usually biotite or hornblende. Granite is identified as a rock rather than a single mineral because its crystals are intergrown.
Field identification & locations
Look for visible interlocking crystals and pink feldspar, translucent gray quartz, and dark mica or amphibole; it should not fizz in dilute hydrochloric acid. Common worldwide, including India, Brazil, Scandinavia, and North America.
