igneous
Granite Pebble
Granite (Felsic Plutonic Rock)
Hardness: 6-7 (Mohs scale); Color: Pink/Red (potassium feldspar) with gray/white and dark veins; Luster: Dull/Granular (weathered); Crystal: Phaneritic (visible crystals); Cleavage: Indistinct
- Hardness
- 6-7 (Mohs scale)
- Color
- Pink/Red (potassium feldspar) with gray/white and dark veins
- Luster
- Dull/Granular (weathered)
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pink/Red (potassium feldspar) with gray/white and dark veins; Luster: Dull/Granular (weathered); Crystal: Phaneritic (visible crystals); Cleavage: Indistinct
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface. High in silica and alkali metal oxides. This specimen has been smoothed by fluvial or glacial weathering.
Uses & applications
Commonly used as construction aggregate, landscaping gravel, and paving material. Polished slabs are used for countertops and monuments.
Geological facts
Granite makes up the majority of the Earth's continental crust. The pink color in this specimen is specifically caused by orthoclase feldspar.
Field identification & locations
Identify in the field by its speckled appearance of interlocking crystals. Found globally in mountainous regions and riverbeds. Look for the presence of quartz, feldspar, and mica.
