igneous
Granite
Granite
Hardness: 6-7 Mohs; Color: Salt and pepper (white/pink/gray/black); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (white/pink/gray/black)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (white/pink/gray/black); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface in plutons. It is a intrusive rock commonly found in continental crust and mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as aggregate for roads.
Geological facts
Granite is one of the hardest substances in the world. It is the signature rock of the continental crust, while basalt is the signature rock of the oceanic crust.
Field identification & locations
Identify by its interlocking granular texture and visible crystals of quartz (clear), feldspar (white/pink), and mica/amphibole (black). It is found in many places, including the Sierra Nevada mountains and New England.
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