igneous
Tumbled granite
Coarse-grained felsic intrusive rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectTypically Mohs 6–7; mottled white, pink, gray, and black with a granular texture and vitreous-to-dull luster. Interlocking crystals are visible; cleavage belongs to individual feldspar and mica grains rather than the whole rock.
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Physical properties
Typically Mohs 6–7; mottled white, pink, gray, and black with a granular texture and vitreous-to-dull luster. Interlocking crystals are visible; cleavage belongs to individual feldspar and mica grains rather than the whole rock.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, commonly during Precambrian to Phanerozoic mountain-building events; this specimen has been rounded and polished by tumbling.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and landscaping material; attractive tumbled pieces are sold for collections and décor.
Geological facts
The pink component is potassium feldspar, translucent grains are quartz, and black flakes or grains are usually biotite or hornblende. Its coarse texture records slow cooling beneath the surface.
Field identification & locations
Identify it by its visible interlocking quartz-feldspar-dark-mineral mosaic and lack of layering or foliation; common worldwide, especially in continental shields and mountain belts.
