igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness: 6-7 on Mohs scale. Color: Pinkish-orange, tan, and grey with black specks. Luster: Dull to vitreous. Structure: Phaneritic (coarse-grained) crystalline. Cleavage: Indistinct. Specific Gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Pinkish-orange, tan, and grey with black specks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Pinkish-orange, tan, and grey with black specks. Luster: Dull to vitreous. Structure: Phaneritic (coarse-grained) crystalline. Cleavage: Indistinct. Specific Gravity: 2.63 to 2.75.
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface. This specimen appears weathered and stained with iron oxides. Found in continental crust formations globally.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, and monuments due to its durability.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest substances in the world, second only to diamonds and some other minerals.
Field identification & locations
Identify by the 'salt and pepper' appearance of interlocking crystals (quartz, feldspar, and mica). This common specimen has a reddish-brown iron patina from weathering. Very common in mountainous regions.
