igneous
Granite Pebble
Granite (Felsic Plutonic Rock)
Hardness: 6-7 Mohs; Color: Gray, tan, white with black flecks; Luster: Dull/Matte (tumbled) to Vitreous (internal crystals); Structure: Phaneritic (visible crystals); Cleavage: None (fractures irregularly); SG: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Gray, tan, white with black flecks
- Luster
- Dull/Matte (tumbled) to Vitreous (internal crystals)
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Gray, tan, white with black flecks; Luster: Dull/Matte (tumbled) to Vitreous (internal crystals); Structure: Phaneritic (visible crystals); Cleavage: None (fractures irregularly); SG: 2.63-2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specific specimen is a water-worn river stone, smoothed over years by fluvial erosion.
Uses & applications
Used in crushed stone for construction, architectural facade when in large slabs, and as decorative river rock for landscaping.
Geological facts
Granite makes up a large portion of the Earth's continental crust and is one of the most recognizable rocks globally due to its unique salt-and-pepper appearance.
Field identification & locations
Identify by looking for interlocked crystals of quartz, feldspar, and dark minerals like biotite. Commonly found in riverbeds, glacial deposits, and mountain ranges.
