igneous
Pink Granite Pebbles
Phaneritic Felsic Intrusive Rock (Granite)
Hardness: 6-7 Mohs; Color: Pink, salmon, or orange due to Potassium Feldspar (Orthoclase), with grey quartz and black speckles; Luster: Dull to pearly; Crystal structure: Phaneritic (visible crystals); Cleavage: Distinct in feldspars, none in quartz; Specific Gravity: 2.63-2.75.
- Hardness
- 6-7 Mohs
- Luster
- Dull to pearly
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, salmon, or orange due to Potassium Feldspar (Orthoclase), with grey quartz and black speckles; Luster: Dull to pearly; Crystal structure: Phaneritic (visible crystals); Cleavage: Distinct in feldspars, none in quartz; Specific Gravity: 2.63-2.75.
Formation & geological history
Formed from the slow crystallization of silica-rich magma below the Earth's surface. This specific specimen is a water-worn river pebble, likely transported and tumbled by glacial or fluvial action over millions of years.
Uses & applications
Used in construction (crushed stone), landscaping, decorative garden paths, architectural veneers, and as polished stones for collectors.
Geological facts
The pink coloration comes from high concentrations of Alkali (Potassium) Feldspar. Granite makes up the majority of Earth's continental crust and some of the oldest exposed rock on the planet is granitic.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance with prominent pink/orange patches and high hardness (it will scratch glass). Commonly found in mountainous regions, riverbeds, and glacial till.
