igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
Hardness: 6-7 Mohs; Color: Pinkish-white background with dark green to black inclusions; Luster: Dull/Waxy (water-worn); Texture: Phaneritic (visible crystals); Specific Gravity: 2.6-2.7
- Hardness
- 6-7 Mohs
- Color
- Pinkish-white background with dark green to black inclusions
- Luster
- Dull/Waxy (water-worn)
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Physical properties
Hardness: 6-7 Mohs; Color: Pinkish-white background with dark green to black inclusions; Luster: Dull/Waxy (water-worn); Texture: Phaneritic (visible crystals); Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specific specimen has been smoothed and rounded by fluvial or glacial transport over thousands of years.
Uses & applications
Used in construction, gravel, landscaping, and architectural stone. As a pebble, it is primarily a collector interest or landscaping material.
Geological facts
Granite makes up much of the Earth's continental crust. The pink color in this specimen comes from potassium feldspar, while the dark specks are likely biotite mica or hornblende.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by steel) and the salt-and-pepper appearance of interlocking crystals. Commonly found in riverbeds, glaciated regions, and mountain ranges.
