Unique Tourmaline

Tourmalines are boron silicate minerals that instruct their rainbow-like colors from diverse elements such equally iron, sodium or magnesium. Tourmaline is classified equally a semi-precious rock in addition to the gemstone comes inwards a broad multifariousness of colors.

System: Trigonal
Hardness: 7

This specimen  from Brazil.

Credit: Heritage Auctions

Sumber http://www.geologyin.com