igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
Hardness: 6-7 (Mohs scale); Color: Mottle gray, white, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained crystals of quartz, feldspar, and mica); Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottle gray, white, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottle gray, white, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained crystals of quartz, feldspar, and mica); Specific gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specific specimen has been smoothed by water erosion through fluvial (river) or glacial transport, making it a water-worn pebble.
Uses & applications
In pebble form, it is used for landscaping, decorative stone, and construction aggregate. In slab form, granite is widely used for countertops and monuments.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Because of its hardness and resistance to acid, it is one of the most durable natural stones used by humans since ancient Egyptian times.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible crystalline grains. Found globally in riverbeds, beaches, and mountainous regions. Collectors look for unique inclusions or high-contrast mineral banding.
