igneous
Tumbled granite
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled white, pink, gray, and reddish-brown; vitreous to dull luster. Hardness about 6–7 Mohs, massive texture, no obvious cleavage as a whole, and specific gravity around 2.6–2.7.
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Physical properties
Coarse-grained, mottled white, pink, gray, and reddish-brown; vitreous to dull luster. Hardness about 6–7 Mohs, massive texture, no obvious cleavage as a whole, and specific gravity around 2.6–2.7.
Formation & geological history
An intrusive felsic igneous rock formed by slow crystallization of silica-rich magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic mountain-building events. The rounded shape is from natural abrasion or tumbling.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and landscaping rock; attractive tumbled pieces are inexpensive decorative or educational specimens.
Geological facts
Visible interlocking crystals distinguish granite from uniform quartzite or fine-grained rhyolite. Pink areas are commonly potassium feldspar, gray translucent grains are quartz, and dark flecks are biotite or hornblende.
Field identification & locations
Identify it by its visible interlocking grains and multicolored feldspar–quartz pattern; quartz scratches glass, while feldspar is commonly near 6 Mohs. Common worldwide, especially in continental shields and mountain belts.
