igneous
Granite
Phaneritic plutonic rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
Hardness: 6-7 (Mohs scale); Color: Mottled pink, grey, and black; Luster: Vitreous to dull; Structure: Phaneritic (visible crystals); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled pink, grey, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled pink, grey, and black; Luster: Vitreous to dull; Structure: Phaneritic (visible crystals); Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen appears to be a weathered or water-worn fragment, likely from a large continental batholith millions of years old.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and cemetery monuments due to its durability and aesthetic appeal.
Geological facts
Granite is the most common igneous rock found on Earth's continents. It contains radioactive elements like thorium and uranium, which produce tiny amounts of radon gas.
Field identification & locations
Identify by its salt-and-pepper appearance and visible crystals of quartz (clear/grey) and feldspar (pink/white). Common in mountain ranges and riverbeds in continental regions.
