igneous
Granite Pebble
Granite (composed of Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale; Color: Mottled gray, white, and black; Luster: Dull to vitreous; Structure: Phaneritic (visible crystals); Cleavage: None (fractures concurrently)
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled gray, white, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled gray, white, and black; Luster: Dull to vitreous; Structure: Phaneritic (visible crystals); Cleavage: None (fractures concurrently)
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen appears to be a water-worn or weathered fragment found in a secondary deposit like a stream or gravel bed.
Uses & applications
Used extensively in construction for countertops, flooring, and monuments; small pebbles are used in landscaping or as aggregate.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most durable substances on the planet.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and the presence of hard, translucent quartz grains mixed with opaque feldspar. Found globally in mountainous regions or riverbeds.
