igneous
Granite River Pebble
Granite (Phaneritic Igneous Rock)
Hardness: 6-7 Mohs; Color: Salt and pepper (white/tan with black and grey); Luster: Dull to vitreous; Crystal structure: Coarse-grained phaneritic; Cleavage: None (fractures)
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (white/tan with black and grey)
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (white/tan with black and grey); Luster: Dull to vitreous; Crystal structure: Coarse-grained phaneritic; Cleavage: None (fractures)
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen has been rounded and smoothed by water erosion in a stream or river environment over thousands of years.
Uses & applications
Landscaping, construction aggregate, decorative river stone, or educational geological specimen.
Geological facts
Granite is the primary component of Earth's continental crust. It is incredibly durable, which is why it is used for monuments and high-traffic flooring.
Field identification & locations
Identify by its interlocking 'salt and pepper' crystalline texture and extreme hardness. Commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
