Tourmaline
Tourmaline is a complex, crystalline boron inosilicate. The mineral is a semi-precious gemstone and occurs in a variety of colors and forms.
Uses
With high transparency and vibrant color, Tourmaline is used in jewelry in the form of facets and valued as a collectible mineral.
| Properties | |
|---|---|
| Chemical Formula | (Ca,K,Na, ▢) / (Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6<br> (BO3)3(Si,Al,B)6O18(OH,F)4) |
| Hardness | 7-7.5 |
| Crystal System | Trigonal |
| Mineral Class | Silicates |
| Luster | Vitreous |