igneous
Granite
Felsic intrusive igneous rock
Hardness: 6-7 on the Mohs scale. Color: Predominantly pink, red, white, or gray with dark speckles. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, visible interlocking crystals). Specific gravity: 2.65 - 2.75.
- Hardness
- 6-7 on the Mohs scale
- Color
- Predominantly pink, red, white, or gray with dark speckles
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on the Mohs scale. Color: Predominantly pink, red, white, or gray with dark speckles. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, visible interlocking crystals). Specific gravity: 2.65 - 2.75.
Formation & geological history
Formed from the slow cooling and crystallization of magma rich in silica and alkali metals far beneath the Earth's surface. Geological age varies greatly, ranging from Precambrian shields to recent mountain-building events.
Uses & applications
Widely used in construction for dimensional stone, floor tiles, counter tops, curbing, and monuments due to its high durability and resistance to weathering.
Geological facts
Granite is the most common rock of the Earth's continental crust and is frequently used as a benchmark for understanding intrusive magmatic processes.
Field identification & locations
Easily identified by its distinct interlocking grains of quartz, potassium feldspar, and plagioclase, often mixed with dark biotite mica. Common globally in mountain ranges and shield areas.
