igneous
Granite Pebble
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Mica)
Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey mottled appearance; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Indistinct; Specific gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, white, and grey mottled appearance
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey mottled appearance; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Indistinct; Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface (intrusive). These rocks can be hundreds of millions to billions of years old, eventually reaching the surface through erosion and tectonic uplift before being rounded by water action.
Uses & applications
Used extensively in construction (countertops, flooring, monuments) and as decorative landscaping stone. Polished pebbles are popular for aquarium decor and rock tumbling.
Geological facts
Granite makes up a large portion of the Earth's continental crust. El Capitan in Yosemite National Park is one of the most famous granite monoliths in the world.
Field identification & locations
Identify in the field by its 'salt and pepper' or multi-colored speckled appearance with visible interlocking crystals. Common on beaches and in riverbeds where water has smoothed the edges. For collectors, look for unique colors like deep reds or large feldspar inclusions.
