igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness: 6-7 on Mohs scale; Color: Mottled grey, white, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled grey, white, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled grey, white, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface (intrusive). Common in continental crust and mountain ranges from various geological eras, especially the Precambrian.
Uses & applications
Extensively used in construction, countertops, monuments, paving stones, and as crushed stone for road aggregate.
Geological facts
Granite is one of the most common rocks in the Earth's continental crust. It is composed primarily of quartz, feldspar, and mica minerals like biotite.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible interlocking crystals. It is found in large mountain batholiths globally. Collectors look for unique mineral inclusions or rare colors.
