igneous
Pink Granite Pebble
Granite (Phaneritic igneous rock)
Hardness: 6-7 Mohs; Color: Pink, white, and gray speckled; Luster: Dull to vitreous; Crystal Structure: Coarse-grained (phaneritic); Cleavage: Indistinct; Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, white, and gray speckled
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, white, and gray speckled; Luster: Dull to vitreous; Crystal Structure: Coarse-grained (phaneritic); Cleavage: Indistinct; Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specific specimen appears to be a water-worn river pebble, likely millions of years old based on typical continental crust ages.
Uses & applications
Used in construction, countertops, and as decorative landscaping gravel. Small pebbles are often collected as beach or river stones.
Geological facts
Granite makes up the majority of Earth's continental crust. The pink color in this specimen is caused by the presence of potassium feldspar (orthoclase).
Field identification & locations
Identify in the field by the visible 'salt and pepper' speckling of different minerals and its extreme hardness. It won't be scratched by a steel knife. Commonly found in mountainous regions or riverbeds downstream from mountains.
