igneous
Granite Pebble
Granite (phaneritic igneous rock)
Hardness: 6-7 (Mohs); Color: Pink, white, and grey speckled; Luster: Dull (weathered) to vitreous; Structure: Crystalline phaneritic; Cleavage: None (fractures); Specific Gravity: 2.6-2.7
- Hardness
- 6-7 (Mohs)
- Color
- Pink, white, and grey speckled
- Luster
- Dull (weathered) to vitreous
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Physical properties
Hardness: 6-7 (Mohs); Color: Pink, white, and grey speckled; Luster: Dull (weathered) to vitreous; Structure: Crystalline phaneritic; Cleavage: None (fractures); Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specimen appears water-worn, likely tumbled in a river or glacial deposit, dating back millions of years depending on the regional craton.
Uses & applications
Used widely in construction (crushed stone), decorative landscaping, and architectural facades. Polished pebbles are used in home decor and aquariums.
Geological facts
Granite is the primary component of Earth's continental crust. The pink color in this specimen is specifically due to potassium-rich alkali feldspar.
Field identification & locations
Identify in the field by the visible 'salt and pepper' interlocking crystals of quartz, feldspar, and mica. Commonly found in mountainous regions or glacial till.
