igneous
Pink Granite
Granite (Alkali-feldspar granite)
Hardness: 6-7 Mohs; Color: Pink, orange, gray, and white; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained) with visible crystals of orthoclase feldspar, quartz, and mica; Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, orange, gray, and white
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, orange, gray, and white; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained) with visible crystals of orthoclase feldspar, quartz, and mica; Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground (intrusive). The pink color is specifically due to a high concentration of potassium-rich feldspar (orthoclase).
Uses & applications
Extensively used in construction, countertops, monuments, floor tiles, and as decorative gravel. Polished varieties are popular for architectural cladding.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Enchanted Rock in Texas and the peaks of the Sierra Nevada are famous examples of granite massifs.
Field identification & locations
Identify by its interlocking crystal texture and the abundance of pink feldspar. Commonly found in mountainous regions or glacial till. Collectors look for unique mineral inclusions like tourmaline or garnet.
