igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
Hardness: 6-7 on Mohs scale; Color: Salt and pepper (pink, white, gray, and black); Luster: Dull to vitreous; Crystal Structure: Phaneritic (visible crystals); Cleavage: None (fractures irregularly).
- Hardness
- 6-7 on Mohs scale
- Color
- Salt and pepper (pink, white, gray, and black)
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Salt and pepper (pink, white, gray, and black); Luster: Dull to vitreous; Crystal Structure: Phaneritic (visible crystals); Cleavage: None (fractures irregularly).
Formation & geological history
Formed from the slow crystallization of silica-rich magma beneath the Earth's surface. This specific specimen has been Rounded and smoothed by water erosion through transport in a river or coastal environment.
Uses & applications
Used in construction, countertops, and monuments; as a pebble, often used for decorative landscaping, aquariums, or as road aggregate.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is extremely durable, which is why it is the preferred material for monuments that must withstand the elements for centuries.
Field identification & locations
Identify by its interlocking crystalline texture and hard minerals that cannot be scratched by a steel nail. Commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
