Collection: Tourmaline

Tourmaline is a mineral whose name changes depending on its color and composition.

The highly popular copper-bearing tourmaline, Paraiba tourmaline. Also, while their compositions differ, there's indigolite, which is in the same blue family. Then there's canary tourmaline (yellow), rubellite (red), and achroite (colorless pure crystal), among others. It is a highly popular stone species with many varieties.

Name: Tourmaline
Japanese Name: Denki-ishi (electric stone)
Chemical Composition: (Varies by type)
Crystal System: Hexagonal
Specific Gravity: 3.0 – 3.3
Mohs Hardness: 7 – 7.5
Cleavage: None
Luster: Vitreous
Transparency: Transparent – Opaque
Refractive Index: 1.614 – 1.666
Birefringence: 0.014 – 0.040
Color: Basically all colors
Dispersion: 0.017