igneous
Pink Granite (Water-worn Pebble)
Felsic Intrusive Igneous Rock (Granite)
Hardness: 6-7 Mohs; Color: Pink, grey, and white; Luster: Vitreous to dull (smoothed by water); Structure: Phaneritic (crystalline grains visible); Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, grey, and white
- Luster
- Vitreous to dull (smoothed by water)
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, grey, and white; Luster: Vitreous to dull (smoothed by water); Structure: Phaneritic (crystalline grains visible); Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specific specimen has been significantly rounded and smoothed by water erosion in a river or beach environment.
Uses & applications
Used widely in construction for countertops, flooring, and monuments; smoothed pebbles like this are often used in landscaping, aquariums, and home decor.
Geological facts
Granite makes up much of the Earth's continental crust. The pink hue is caused by an abundance of potassium feldspar (orthoclase). It is one of the hardest and most durable common stones.
Field identification & locations
Identify by its 'salt and pepper' appearance with visible crystals of pink feldspar, clear/grey quartz, and dark mica. Commonly found in glaciated regions or areas with exposed batholiths.
