igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness: 6-7 (Mohs scale); Color: Pink, white, gray, black; Luster: Dull to vitreous; Crystal Structure: Phaneritic (large, visible crystals); Cleavage: Distinct in feldspar, none in quartz; Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Pink, white, gray, black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pink, white, gray, black; Luster: Dull to vitreous; Crystal Structure: Phaneritic (large, visible crystals); Cleavage: Distinct in feldspar, none in quartz; Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. Common in continental crust, often found in mountain ranges and batholiths dating back millions to billions of years.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability.
Geological facts
Granite is the most common igneous rock found on Earth's continents. It contains mainly quartz, orthoclase feldspar, and mica or amphibole.
Field identification & locations
Identify by its coarse-grained, interlocking crystals of different colors. Commonly found in riverbeds or near mountain ranges. Collectors look for specific mineral infusions like garnet or unique color patterns.
