igneous
Granite
Felsic intrusive igneous rock
Hardness: 6 on the Mohs scale. Color: Varies widely (pink, white, grey, black) depending on mineral composition. Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained visible crystals). Specific gravity: 2.65 to 2.75.
- Hardness
- 6 on the Mohs scale
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6 on the Mohs scale. Color: Varies widely (pink, white, grey, black) depending on mineral composition. Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained visible crystals). Specific gravity: 2.65 to 2.75.
Formation & geological history
Formed from the slow cooling of magma rich in silica and alkali metal oxides that takes place deep underground within the Earth's crust.
Uses & applications
Widely used in construction, countertops, floor tiles, paving, curbing, and monuments.
Geological facts
Granite is the most common igneous rock in the Earth's continental crust and forms the core of many mountain ranges.
Field identification & locations
Easily identified by its speckled appearance showing visible interlocked crystals of quartz, feldspar, and micas. Found globally in continental shields and intrusive mountain roots.
