igneous
Tumbled Granite
Granite (composed of Quartz, Feldspar, and Mica)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale); Color: Mottled grey, white, and black; Luster: Vitreous/shiny (when polished); Structure: Phaneritic (granular); Cleavage: None (fractures)
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled grey, white, and black
- Luster
- Vitreous/shiny (when polished)
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled grey, white, and black; Luster: Vitreous/shiny (when polished); Structure: Phaneritic (granular); Cleavage: None (fractures)
Formation & geological history
Intrusive igneous rock formed from the slow cooling of silica-rich magma deep underground. Common in continental crust and mountain ranges from various geological eras.
Uses & applications
Landscaping, decorative stones, countertops (in slab form), and pocket stones for collectors.
Geological facts
Granite makes up much of Earth's continental crust and is one of the hardest natural stones. It is resistant to acid and very durable.
Field identification & locations
Identify by its salt-and-pepper appearance and the presence of visible, interlocking crystals of different colors. Commonly found in riverbeds or mountain outcroppings.
