igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness: 6-7 on Mohs scale. Color: Phaneritic (visible crystals) mix of white, pink, and grey. Luster: Dull to vitreous. Crystal structure: Granular/crystalline. Cleavage: Indistinct. Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Phaneritic (visible crystals) mix of white, pink, and grey
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Phaneritic (visible crystals) mix of white, pink, and grey. Luster: Dull to vitreous. Crystal structure: Granular/crystalline. Cleavage: Indistinct. Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed from the slow crystallization of silica-rich magma below the Earth's surface. This specimen appears water-worn, likely tumbled in a river or creek bed over geological time.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability and hardness.
Geological facts
Granite makes up much of the Earth's continental crust. It is primarily composed of quartz, feldspar (orthoclase and plagioclase), and mica (biotite or muscovite).
Field identification & locations
Identify by its interlocking 'salt and pepper' crystalline texture and extreme hardness. Commonly found in mountainous regions or as glacial erratics and river cobbles.
