igneous
Granite
Phaneritic intrusive igneous rock
Hardness: 6-7 Mohs; Color: Salt and pepper (white, grey, black); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Composition: Quartz, Feldspar, and Mica/Amphibole.
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (white, grey, black)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (white, grey, black); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Composition: Quartz, Feldspar, and Mica/Amphibole.
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. This specimen appears holocrystalline, indicating a plutonic origin where cooling occurred over thousands of years.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, curbing, and as a decorative architectural stone due to its durability.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest natural stones and is resistant to most acids, making it ideal for kitchen surfaces.
Field identification & locations
Identified in the field by its visible interlocking crystals of different colors. It is found in large mountain ranges and batholiths globally. Collectors look for unique mineral inclusions or rare colors.
