igneous
Granite
Intrusive igneous felsic rock
Hardness (Mohs): 6-7; Color: Pink, white, gray, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
- Color
- Pink, white, gray, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness (Mohs): 6-7; Color: Pink, white, 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 the Earth's surface (plutonic). It is primarily found in the continental crust and can date back to billions of years (Archean Eon) to more recent periods.
Uses & applications
Widely used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as crushed stone for road base.
Geological facts
Granite is the most common igneous rock found at the Earth's surface and makes up a large part of the continental crust. The Yosemite Valley in California features massive granite monoliths.
Field identification & locations
Identify by its interlocking 'salt and pepper' appearance of quartz, feldspar, and mica. It is ubiquitous in mountainous regions and continental shields. Collectors look for unique mineral inclusions or rare colors.
