Crystal Green Tourmaline Quartz

Chemical Formula

Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

Color

White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Gray, Black, Multicolored

Hardness

7 - 7.5

Crystal System

Hexagonal

Refractive Index

1.616 - 1.650

SG

2.9 - 3.3

Transparency

Transparent to opaque

Double Refraction

.018

Luster

Vitreous

Cleavage

3,2

Mineral Class

Tourmaline