igneous
Granite Pebble
Granite (plutonic felsic rock)
Hardness: 6-7 on Mohs scale; Color: off-white to pale pink with grey quartz and dark biotite grains; Luster: dull to vitreous; Texture: phaneritic, medium-grained, rounded by erosion; Specific Gravity: ~2.65-2.75
- Hardness
- 6-7 on Mohs scale
- Luster
- dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: off-white to pale pink with grey quartz and dark biotite grains; Luster: dull to vitreous; Texture: phaneritic, medium-grained, rounded by erosion; Specific Gravity: ~2.65-2.75
Formation & geological history
Formed by slow cooling and crystallization of felsic magma deep within the Earth's crust (plutonic environment). Subsequently eroded, weathered, and rounded by water or glacial action.
Uses & applications
Commonly used in landscaping, river rock gravel, construction aggregate, and as decorative pebbles.
Geological facts
Granite forms a large portion of the continental crust. Small stream-worn pebbles like this one often travel miles down rivers, smoothing out sharp edges over thousands of years.
Field identification & locations
Identified by visible interlocking grains of quartz (translucent grey), feldspar (pinkish-white), and mica/amphibole (black specks). Found abundantly in riverbeds, glacial deposits, and beaches globally.
