igneous
Granite (Pink/Red Granite)
Phaneritic Felsic Igneous Rock
Hardness: 6-7 on Mohs scale; Color: Pink, salmon, or reddish-orange tones mixed with grey and black; Luster: Vitreous to pearly on crystal faces; Structure: Coarse-grained phaneritic texture with visible crystals of orthoclase feldspar, quartz, and mica; Cleavage: Feldspar shows two planes at 90 degrees.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to pearly on crystal faces
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, salmon, or reddish-orange tones mixed with grey and black; Luster: Vitreous to pearly on crystal faces; Structure: Coarse-grained phaneritic texture with visible crystals of orthoclase feldspar, quartz, and mica; Cleavage: Feldspar shows two planes at 90 degrees.
Formation & geological history
Formed through the slow crystallization of silica-rich magma deep beneath the Earth's surface (plutonic). This process can take millions of years, often occurring in continental crust during orogenic (mountain-building) events.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability and aesthetic appeal. It is also crushed for road base and railroad ballast.
Geological facts
The pink color in this specimen is specifically due to a high concentration of Potassium Feldspar (Orthoclase). Continental crust is primarily composed of various types of granite.
Field identification & locations
Identify by its 'salt and pepper' or interlocking crystalline appearance where crystals are large enough to see with the naked eye. Found globally in mountainous regions or ancient continental shields. Does not react with acid.
