igneous
Pink Granite
Phaneritic intrusive igneous rock with Potassium Feldspar (KAlSi3O8) and Quartz (SiO2)
Hardness: 6-7 (Mohs), Color: Pink to reddish with grey and white grains, Luster: Vitreous to dull, Crystal Structure: Granular/Phaneritic, Cleavage: Two directions at 90 degrees in feldspars, Specific Gravity: 2.63 to 2.75
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Physical properties
Hardness: 6-7 (Mohs), Color: Pink to reddish with grey and white grains, Luster: Vitreous to dull, Crystal Structure: Granular/Phaneritic, Cleavage: Two directions at 90 degrees in feldspars, Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface in continental crust. The pink color is caused by a high concentration of potassium feldspar (orthoclase). These are plutonic rocks that cool over millions of years.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments. Also used as crushed stone in roadbeds and as decorative landscaping rock.
Geological facts
Granite is one of the hardest substances in the world. The pink color specifically usually indicates a rich source of orthoclase feldspar. Many of the world's most famous mountain ranges, like the Sierra Nevada, are composed primarily of granite batholiths.
Field identification & locations
Identify in the field by its speckled 'salt and pepper' appearance combined with pink hues. It is characterized by coarse, visible crystals of quartz (clear/grey) and feldspar (pink/white). Found globally in continental shields.
