igneous
Granite
Phaneritic plutonic rock (SiO2 > 69%)
Hardness: 6-7 Mohs; Color: Grey/white/tan with black flecks; Luster: Vitreous/pearly; Crystal structure: Phaneritic (coarse-grained) containing quartz, feldspar, and mica; Specific Gravity: 2.63 to 2.75.
- Hardness
- 6-7 Mohs
- Color
- Grey/white/tan with black flecks
- Luster
- Vitreous/pearly
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Physical properties
Hardness: 6-7 Mohs; Color: Grey/white/tan with black flecks; Luster: Vitreous/pearly; Crystal structure: Phaneritic (coarse-grained) containing quartz, feldspar, and mica; Specific Gravity: 2.63 to 2.75.
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface (intrusive). Mostly formed during various orogenic (mountain-building) events throughout Earth's history, commonly in the Precambrian or Paleozoic eras.
Uses & applications
Extensively used in construction, flooring, kitchen countertops, fireplace surrounds (as seen in the image), monuments, and as crushed stone for road base.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest natural stones available, which is why it has been used in architecture since Ancient Egypt.
Field identification & locations
Identified by its 'salt and pepper' appearance and visible interlocking crystals. Found globally in the cores of mountain ranges and continental shields. Highly durable for home interior use.
