igneous
Granite
Granite (composed of Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale; Color: Light gray with black flecks; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained texture); Cleavage: None (individual minerals have cleavage); Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Light gray with black flecks
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Light gray with black flecks; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained texture); Cleavage: None (individual minerals have cleavage); Specific gravity: 2.63 to 2.75
Formation & geological history
Intrusive igneous rock formed from the slow cooling and crystallization of magma deep beneath the Earth's surface during various geological periods.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, curbing, and as a decorative stone in monuments.
Geological facts
Granite is the most common igneous rock found on Earth's continents. The black specks seen in this specimen are likely biotite mica or hornblende crystals.
Field identification & locations
Identify by its phaneritic (visible grains) texture and a mix of light-colored minerals (quartz/feldspar) and dark minerals. Common in mountain ranges and river deposits.
