igneous
Granite Pebble
Granite (Phaneritic Igneous Rock)
Hardness: 6-7 (Mohs scale); Color: Mottled pink, white, grey, and black; Luster: Dull to vitreous; Texture: Coarse-grained (phaneritic); Structure: Massive; Specific Gravity: 2.63–2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled pink, white, grey, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled pink, white, grey, and black; Luster: Dull to vitreous; Texture: Coarse-grained (phaneritic); Structure: Massive; Specific Gravity: 2.63–2.75
Formation & geological history
Formed from the slow cooling and solidification of magma below the Earth's surface (intrusive). This specimen has been rounded and smoothed by water erosion in a river, stream, or coastal environment. These rocks can date back hundreds of millions to billions of years.
Uses & applications
Granite is primarily used in construction for countertops, flooring, and curb stones. This small natural pebble is mainly a collector’s curiosity or used in decorative landscaping and aquarium gravel.
Geological facts
Granite is the most common rock found in the Earth's continental crust. The pink color in this specimen likely comes from potassium feldspar (orthoclase).
Field identification & locations
Identifiable by its 'salt and pepper' appearance and visible interlocking crystals of quartz, feldspar, and mica. Commonly found in mountainous regions or riverbeds downstream from granitic batholiths. Collectors look for unique mineral patterns or high-translucency quartz grains within the matrix.
