igneous
Granite
Granite
Hardness: 6-7 on Mohs scale; Color: Pinkish-tan with grey and black inclusions; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Distinct in feldspar grains; Specific gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pinkish-tan with grey and black inclusions
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pinkish-tan with grey and black inclusions; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Distinct in feldspar grains; Specific gravity: 2.63-2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. It is an intrusive igneous rock typical of continental crust, often dating from the Precambrian to Cenozoic eras.
Uses & applications
Extensively used 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 on Earth's continents. The iconic peaks of Yosemite National Park are composed primarily of granite.
Field identification & locations
Identify by its interlocking grains of quartz, feldspar, and mica. It is found in mountain ranges and continental shields worldwide. For collectors, look for large, well-defined crystals.
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