igneous
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
Hardness: 6-7 (Mohs scale), Color: Pink, red, white, and black speckled, Luster: Vitreous to dull, Structure: Phaneritic (coarse-grained), Cleavage: None (rock) but minerals within exhibit cleavage
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Pink, red, white, and black speckled, Luster: Vitreous to dull, Structure: Phaneritic (coarse-grained), Cleavage: None (rock) but minerals within exhibit cleavage
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface (intrusive). The pink color comes from an abundance of potassium feldspar (orthoclase). Found in continental crust plates globally.
Uses & applications
Used extensively in construction for countertops, floor tiles, monuments, curbing, and as decorative dimension stone.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Famous peaks like Half Dome in Yosemite and the core of the Egyptian pyramids are made of types of granite.
Field identification & locations
Identify in the field by its coarse interlocking crystals and 'salt and pepper' appearance with pink highlights. It is found in mountain ranges and eroded shield areas. It is extremely durable and weather-resistant.
