igneous
Pink Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Pink, grey, and white mottled appearance; Luster: Dull (weathered) to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific Gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, grey, and white mottled appearance
- Luster
- Dull (weathered) to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, grey, and white mottled appearance; Luster: Dull (weathered) to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specific specimen has been smoothed and rounded by water erosion in a river or glacial environment over thousands of years.
Uses & applications
Used primarily in landscaping, construction aggregate, and as decorative garden stones. High-quality granite is used for countertops and monuments.
Geological facts
The pink color comes from Potassium Feldspar (Orthoclase). Granite makes up much of the Earth's continental crust and is one of the hardest natural stones.
Field identification & locations
Identify by its interlocking 'salt and pepper' crystalline texture and pink/orange hue. Common in mountain ranges and glacial till across North America and Europe. Look for it in riverbeds and along coastlines.
