igneous
Pink Granite
Felsic Intrusive Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
Hardness: 6-7 on Mohs scale. Color: Salmon pink to reddish-brown with grey and white specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Cleavage: Perfect in two directions for feldspar components.
- Hardness
- 6-7 on Mohs scale
- Color
- Salmon pink to reddish-brown with grey and white specks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Salmon pink to reddish-brown with grey and white specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Cleavage: Perfect in two directions for feldspar components.
Formation & geological history
Formed from the slow cooling and crystallization of magma deep beneath the Earth's surface (plutonic). Typical ages range from Proterozoic to Cenozoic depending on the specific batholith origin.
Uses & applications
Extensively used in construction for countertops, floor tiles, and outdoor monuments. Crushed granite is also used for road base and railroad ballast. Larger pieces are often used in landscaping.
Geological facts
The pink color is caused by an abundance of potassium feldspar (orthoclase). Granite makes up a large portion of the Earth's continental crust. It is often much harder and more durable than marble.
Field identification & locations
Identify by its interlocking 'salt and pepper' texture where crystals are large enough to see with the naked eye. Found worldwide in continental shield areas like the Canadian Shield or the Scottish Highlands. Collectors looking for unique specimens should look for large phenocrysts.
