Feldspar
mineral · common
Quick facts
- Formula
- KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8
- Hardness
- 6–6.5
- Luster
- Vitreous
- Colors
- White, pink, cream, gray
A group of rock-forming tectosilicates that make up more than half of Earth's crust.
Two cleavage planes near 90°. Common in granite, gneiss, and many igneous rocks.
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