igneous
Granite Pebble
Felsic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale; Color: typically white, grey, or pink with dark speckles; Luster: dull to vitreous; Structure: phaneritic (visible crystals); Specific Gravity: 2.63 - 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- typically white, grey, or pink with dark speckles
- Luster
- dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: typically white, grey, or pink with dark speckles; Luster: dull to vitreous; Structure: phaneritic (visible crystals); Specific Gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow cooling and crystallization of magma deep within the Earth's crust. This specific specimen has been tumbled and rounded by water action over geological time.
Uses & applications
Used widely in construction (aggregate, countertops, flooring), decorative landscaping (as river rock), and road building due to its extreme durability and resistance to weathering.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is incredibly old; most continental granite dates back hundreds of millions or even billions of years.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals. It is ubiquitous in riverbeds, glacial tills, and mountainous regions worldwide.
