igneous
Granite Pebble
Granite (Felsic intrusive igneous rock)
Hardness: 6-7 Mohs; Color: Mottled grey, white, and tan; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible interlocking crystals); Cleavage: None (fractures irregularly).
- Hardness
- 6-7 Mohs
- Color
- Mottled grey, white, and tan
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled grey, white, and tan; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible interlocking crystals); Cleavage: None (fractures irregularly).
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This pebble has been weathered and rounded by water or glacial transport, likely originating from ancient batholiths.
Uses & applications
Large-scale granite is used for construction and countertops; as a small rounded pebble, it is primarily used in landscaping, decorative ground cover, or as aggregate.
Geological facts
Granite is the most common rock found in the Earth's continental crust. It contains quartz, feldspar, and mica minerals.
Field identification & locations
Identify by its salt-and-pepper appearance and grains that are large enough to see with the naked eye. Commonly found in riverbeds, beaches, and glacial till.
