igneous
Granite
Intrusive Igneous Rock
Hardness: 6 on the Mohs scale. Color: Light gray with speckled dark grains. Luster: Dull to sub-vitreous. Crystal structure: Phaneritic (coarse-grained, visible interlocking crystals). Cleavage: None distinct. Specific gravity: 2.65 - 2.75.
- Hardness
- 6 on the Mohs scale
- Color
- Light gray with speckled dark grains
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 6 on the Mohs scale. Color: Light gray with speckled dark grains. Luster: Dull to sub-vitreous. Crystal structure: Phaneritic (coarse-grained, visible interlocking crystals). Cleavage: None distinct. Specific gravity: 2.65 - 2.75.
Formation & geological history
Formed from the slow cooling and crystallization of magma beneath the Earth's surface, typically over millions of years, commonly associated with continental crust.
Uses & applications
Used widely in construction, monuments, countertops, architectural facings, and as crushed stone for paving.
Geological facts
Granite makes up a major part of the continental crust on Earth. Due to its durability, it has been used as a building material since ancient times.
Field identification & locations
Easily identified by its characteristic speckled appearance featuring quartz, feldspar, and mica minerals. Found globally in mountain ranges and shields.
