igneous
Granite
Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)
Hardness: 6-7 Mohs; Color: White and grey mottled; Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained) igneous; Cleavage: Two directions on feldspar, none on quartz; Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 Mohs
- Color
- White and grey mottled
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 Mohs; Color: White and grey mottled; Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained) igneous; Cleavage: Two directions on feldspar, none on quartz; Specific gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). It is a major component of continental crust and often dates back hundreds of millions of years to the Precambrian era.
Uses & applications
Primarily used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability and aesthetic appeal.
Geological facts
Granite is the most common igneous rock found on Earth's surface. It makes up much of the core of mountain ranges and is exceptionally resistant to weathering.
Field identification & locations
Identify by its interlocking texture of light-colored minerals (feldspar) and glassy minerals (quartz). Found in mountainous regions and glacial deposits globally. Collectors look for large crystals or unique color variations.
