igneous
Tumbled pink granite
Granite; mainly quartz, potassium feldspar, plagioclase feldspar, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled pink, gray, white, and black appearance with a granular texture; vitreous feldspar/quartz luster and no obvious cleavage as a whole rock. Typical hardness is about 6–7 Mohs and specific gravity 2.63–2.75.
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Physical properties
Coarse-grained, speckled pink, gray, white, and black appearance with a granular texture; vitreous feldspar/quartz luster and no obvious cleavage as a whole rock. Typical hardness is about 6–7 Mohs and specific gravity 2.63–2.75.
Formation & geological history
An intrusive felsic igneous rock formed when silica-rich magma slowly crystallized deep underground, commonly during Precambrian to Phanerozoic mountain-building events. The rounded shape and smooth surface indicate human tumbling or natural abrasion.
Uses & applications
Used widely as dimension stone, countertops, monuments, paving, aggregate, and decorative tumbled stone; this small specimen has modest lapidary and collecting interest.
Geological facts
Pink coloration commonly comes from potassium feldspar, while dark flecks are usually biotite or hornblende. Granite’s visible interlocking crystals reflect slow underground cooling.
Field identification & locations
Identify it by its coarse interlocking grains, pink feldspar, gray/clear quartz, and scattered black mica or amphibole; it is common in continental crust worldwide, including India, Brazil, Canada, Scandinavia, and the United States.
