igneous
Pink Granite River Pebble
Phaneritic Felsic Igneous Rock (Granite)
Phaneritic texture with visible crystals of pink potassium feldspar, translucent quartz, and minor dark minerals. Hardness: 6-7 on Mohs scale. Luster: Dull (weathered) to vitreous (broken surfaces). Color: Mottled pink, orange-red, and grey.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled pink, orange-red, and grey
- Luster
- Dull (weathered) to vitreous (broken surfaces)
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Physical properties
Phaneritic texture with visible crystals of pink potassium feldspar, translucent quartz, and minor dark minerals. Hardness: 6-7 on Mohs scale. Luster: Dull (weathered) to vitreous (broken surfaces). Color: Mottled pink, orange-red, and grey.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground (plutonic). This specific specimen is a water-worn pebble, likely eroded from a larger batholith and smoothed by fluvial or glacial action over thousands of years.
Uses & applications
Granite is widely used in construction for countertops, flooring, and road gravel. As a river pebble, it is commonly used in landscaping, decorative rock gardens, and as aquarium substrate.
Geological facts
The pink color is primarily caused by an abundance of orthoclase (potassium feldspar). Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most durable common rocks.
Field identification & locations
Identify in the field by its 'salt and pepper' or mottled appearance and extreme hardness (cannot be scratched by a steel knife). Look for it in riverbeds, glacial tills, and mountainous regions containing igneous intrusions.
