igneous
Granite
Intrusive Igneous Rock (Granitic)
Hardness: 6-7 on Mohs scale; Color: Pinkish-tan with orange/rusty iron staining; Luster: Dull to vitreous; Crystal structure: Phaneritic (medium-to-coarse grained); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pinkish-tan with orange/rusty iron staining
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pinkish-tan with orange/rusty iron staining; Luster: Dull to vitreous; Crystal structure: Phaneritic (medium-to-coarse grained); Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen appears weathered with iron oxide staining, likely from long-term exposure to water and air.
Uses & applications
Primary use in construction (countertops, flooring, monuments) and as crushed stone for road base or railroad ballast.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most durable natural stones, which is why it has been used in megalithic structures since ancient Egypt.
Field identification & locations
Identified by its visible interlocking crystals of quartz, feldspar, and mica. It is found globally in mountain ranges and continental shields. Look for 'salt and pepper' appearance and high durability.
