igneous
Granite Pebble
Granite
Hardness: 6 to 7 on Mohs scale. Color: Speckled grayish-green, white, and dark spots. Luster: Dull to sub-vitreous. Texture: Medium-grained phaneritic, rounded pebble due to water erosion.
- Hardness
- 6 to 7 on Mohs scale
- Color
- Speckled grayish-green, white, and dark spots
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 6 to 7 on Mohs scale. Color: Speckled grayish-green, white, and dark spots. Luster: Dull to sub-vitreous. Texture: Medium-grained phaneritic, rounded pebble due to water erosion.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive igneous). Rounded into a pebble via fluvial or coastal water action over time.
Uses & applications
Commonly used as construction aggregate, landscaping pebbles, architectural stone, and for decorative river-rock displays.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Over millions of years, weathering and stream transport turn coarse blocky granite into smooth river pebbles.
Field identification & locations
Identified by its salt-and-pepper or multi-colored granular texture containing visible interlocking quartz, feldspar, and mafic minerals. Commonly found in riverbeds, lakeshores, and glacial deposits worldwide.
