igneous / metamorphic
Pink Granite / Gneiss
Felsic Plutonic Rock (Granite) with Gneissic banding
Hardness: 6-7 (Mohs scale); Color: Pink, orange, gray, and black; Luster: Dull to vitreous; Structure: Phaneritic (large crystals) with evidence of foliation; Specific Gravity: 2.6-2.7
- Hardness
- 6-7 (Mohs scale)
- Color
- Pink, orange, gray, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pink, orange, gray, and black; Luster: Dull to vitreous; Structure: Phaneritic (large crystals) with evidence of foliation; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the slow cooling of silica-rich magma beneath the Earth's surface (igneous). The visible banding suggests it may have undergone high-grade metamorphism (Gneiss) or contains pegmatitic intrusions.
Uses & applications
Used in construction as dimension stone, countertops, paving, and decorative garden rock. Larger boulders are used for landscaping and monuments.
Geological facts
Granite makes up the majority of the Earth's continental crust. The pink color is specifically due to a high concentration of potassium feldspar (orthoclase).
Field identification & locations
Identify by its interlocking 'salt and pepper' crystals and pink feldspar. It is commonly found in old mountain belts and continental shields. It is highly resistant to weathering.
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