igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale. Color: Mottled gray, white, and black with slight yellowish patches. Luster: Dull to Vitreous (shiny on crystal faces). Structure: Phaneritic (coarse-grained) crystalline. Composition: Primarily quartz, feldspar, and mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled gray, white, and black with slight yellowish patches
- Luster
- Dull to Vitreous (shiny on crystal faces)
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled gray, white, and black with slight yellowish patches. Luster: Dull to Vitreous (shiny on crystal faces). Structure: Phaneritic (coarse-grained) crystalline. Composition: Primarily quartz, feldspar, and mica.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). Geological age varies from Precambrian to Cenozoic depending on the tectonic setting of the pluton.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability and resistance to weathering.
Geological facts
Granite makes up a massive portion of the Earth's continental crust. It is one of the hardest substances in the world, second only to diamonds among common minerals/rocks.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible, interlocking crystals of quartz (clear/gray) and feldspar (white/pink). Found in mountainous regions and areas where ancient roots of mountains have been exposed.
