igneous
Granite Boulder
Intrusive Igneous Rock
Hardness: 6-7 on Mohs scale; Color: Varies from pink to gray depending on feldspar content; Luster: Dull to vitreous; Crystal structure: Phaneric, coarse-grained with visible interlocking crystals of quartz, feldspar, and micas; Specific gravity: 2.65-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Varies from pink to gray depending on feldspar content
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Varies from pink to gray depending on feldspar content; Luster: Dull to vitreous; Crystal structure: Phaneric, coarse-grained with visible interlocking crystals of quartz, feldspar, and micas; Specific gravity: 2.65-2.75
Formation & geological history
Formed from the slow cooling and crystallization of magma far beneath the Earth's surface over millions of years.
Uses & applications
Commonly used in construction, monument building, countertops, and architectural facing stone.
Geological facts
Granite is the most common igneous rock in the Earth's continental crust and is exceptionally durable against weathering.
Field identification & locations
Easily identified in the field by its distinct speckled appearance and visible mineral grains (quartz, feldspar, biotite). Found worldwide in major mountain ranges and continental shields.
