igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
Hardness: 6-7 (Mohs scale); Color: speckled pink, white, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (visible crystals); Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- speckled pink, white, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: speckled pink, white, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (visible crystals); Specific gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This is a plutonic rock found in continental crust and can be billions of years old.
Uses & applications
Used widely in construction for countertops, aggregate in concrete, road base, and decorative landscaping stones.
Geological facts
Granite is the most common igneous rock found on Earth's continents and makes up the core of major mountain ranges.
Field identification & locations
Identify by its 'salt and pepper' or multi-colored speckled appearance and extreme hardness. It won't be scratched by a steel knife. Commonly found in riverbeds or as glacial till.
