igneous
Granite
Granite (Felsic Intrusive Igneous Rock)
Hardness: 6-7 on Mohs scale; Color: Salt and pepper (white/tan with black flecks); Luster: Dull to phaneritic (visible crystals); Structure: Granular/Massive; Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Salt and pepper (white/tan with black flecks)
- Luster
- Dull to phaneritic (visible crystals)
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Salt and pepper (white/tan with black flecks); Luster: Dull to phaneritic (visible crystals); Structure: Granular/Massive; Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen appears water-worn into a river stone shape, often originating from ancient plutonic formations.
Uses & applications
Used widely in construction for countertops, floor tiles, paving stone, and monuments. Smooth river-worn specimens are popular for decorative landscaping.
Geological facts
Granite makes up a large part of the continental crust. The term ‘Granite’ comes from the Latin ‘granum’, meaning a grain, in reference to its coarse-grained structure.
Field identification & locations
Identify by its interlocking crystalline texture containing quartz (clear), feldspar (white/pink), and mica (black flecks). Commonly found in mountain ranges or riverbeds downstream from batholiths.
