igneous
Granite Pebble
Granite (Phaneritic Igneous Rock)
Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey mottled; Luster: Dull/earthy (weathered); Crystal structure: Granular/crystalline; Cleavage: None (fractures irregularly); Specific gravity: 2.6-2.7
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, white, and grey mottled
- Luster
- Dull/earthy (weathered)
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey mottled; Luster: Dull/earthy (weathered); Crystal structure: Granular/crystalline; Cleavage: None (fractures irregularly); Specific gravity: 2.6-2.7
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground (plutonic), typically billions or millions of years old. This specimen is a water-worn or weathered pebble found in fluvial or glacial deposits.
Uses & applications
Used primarily as decorative gravel, in landscaping, or as a constituent of construction aggregate. Polished granite is used for countertops and monuments.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Over time, erosion brings these underground formations to the surface, where they break into smaller pieces like this pebble.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible interlocking crystals of quartz and feldspar. Found globally in mountainous regions and riverbeds.
