igneous
Pink Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 Mohs; Color: Pink, orange-tan, grey, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (visible crystals); Cleavage: Perfect in two directions for feldspar; Specific Gravity: 2.63-2.75.
- Hardness
- 6-7 Mohs
- Color
- Pink, orange-tan, grey, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, orange-tan, grey, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (visible crystals); Cleavage: Perfect in two directions for feldspar; Specific Gravity: 2.63-2.75.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. High potassium feldspar content gives it the pink hue. These rocks can range from Precambrian to Cenozoic era environments.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stone, curbing, and as a decorative stone in monuments and jewelry (lapidary).
Geological facts
Granite makes up a large portion of the Earth's continental crust. Mount Rushmore is carved into a granite batholith. It is one of the hardest and most durable natural stones available.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance with pinkish hues and visible crystalline structure. Found in mountainous regions, shield areas, and as river-worn pebbles in glacial till.
