igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
Hardness: 6-7 (Mohs scale); Color: Mottled orange, brown, gray, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled orange, brown, gray, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled orange, brown, gray, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specific countertop variety likely dates back hundreds of millions of years and formed in a plutonic environment.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stone, curbing, and monuments due to its durability and aesthetic appeal.
Geological facts
Granite is the most common igneous rock found at Earth's surface and makes up a significant portion of the continental crust. The name comes from the Latin 'granum', meaning a grain.
Field identification & locations
Identify by its interlocking granular texture of light and dark minerals. Common in mountain ranges and shield areas globally. Collectors often look for unique pegmatite or porphyritic variations.
