igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
Hardness: 6-7 Mohs; Color: Pink, orange, gray, and black; Luster: Dull to vitreous; Structure: Phaneritic (large, visible crystals); Composition: Orthoclase feldspar, quartz, and minor mica/amphibole.
- Hardness
- 6-7 Mohs
- Color
- Pink, orange, gray, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, orange, gray, and black; Luster: Dull to vitreous; Structure: Phaneritic (large, visible crystals); Composition: Orthoclase feldspar, quartz, and minor mica/amphibole.
Formation & geological history
Formed by the slow cooling of silica-rich magma deep underground (plutonic formation). The presence of potassium-rich feldspar (Orthoclase) gives it the distinct salmon-pink or orange hue.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, monuments, and as crushed stone for road base.
Geological facts
Pink granite is the state rock of New Hampshire and is the primary component of many famous mountain ranges, including the Enchanted Rock in Texas.
Field identification & locations
Identify in the field by the visible 'salt and pepper' texture mixed with large blocks of pink feldspar. It will not be scratched by a steel knife. Common in continental shields and mountain belts.
