igneous
Granite
Granite (Intrusive Igneous Rock)
Hardness: 6 on the Mohs scale. Color: Generally pink, white, grey, or black with visible interlocking mineral grains. Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained texture with visible crystals). Specific gravity: 2.65 to 2.75.
- Hardness
- 6 on the Mohs scale
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6 on the Mohs scale. Color: Generally pink, white, grey, or black with visible interlocking mineral grains. Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained texture with visible crystals). Specific gravity: 2.65 to 2.75.
Formation & geological history
Formed from the slow cooling of magma rich in silica and alkali metal oxides beneath the Earth's surface over millions of years.
Uses & applications
Commonly used in construction, countertops, architectural facings, monuments, and curbing.
Geological facts
Granite is the most common igneous rock in the Earth's continental crust and forms the core of many mountain ranges.
Field identification & locations
Identify by its interlocking grains of quartz, feldspar, and mica. Found worldwide in continental shields and intrusive plutons.
