igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
Hardness: 6-7 on Mohs scale; Color: Multi-colored with tan, grey, and white grains; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible interlocking crystals); Composition: Principally quartz, feldspar, and mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Multi-colored with tan, grey, and white grains
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Multi-colored with tan, grey, and white grains; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible interlocking crystals); Composition: Principally quartz, feldspar, and mica.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specific specimen has been rounded by fluvial processes (water erosion) in a river or stream environment.
Uses & applications
Used in landscaping, construction aggregate, and gravel. Larger blocks are used for countertops and monuments.
Geological facts
Granite makes up a large part of the Earth's continental crust. It is one of the hardest and most durable common stones.
Field identification & locations
Identify by its 'salt and pepper' look or multi-colored speckled appearance and extreme hardness. Commonly found in riverbeds, glacial tills, and mountainous regions.
