igneous
Granite Pebble
Granite (Felsic Plutonic Rock)
Hardness: 6-7 Mohs; Color: Mottled pink, white, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 Mohs
- Color
- Mottled pink, white, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled pink, white, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specimen appears water-worn, suggesting a secondary transport phase in a river or glacial environment.
Uses & applications
Used primarily in decorative landscaping, construction aggregate, and countertops in its larger slab form.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Its pink color usually comes from potassium feldspar.
Field identification & locations
Identify by its interlocking crystalline texture and the presence of quartz (glassy parts) and feldspar (opaque parts). Found globally in mountainous regions and glacial till.
