Black Tourmaline (Schorl) Specimen #2

Schorl [Na(Fe²⁺₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)] was discovered as early as 1500 AD and perhaps earlier. The first written mention of the name and an accurate description of the mineral is noted in 1505 AD!

A cyclosilicate (named for the shape of it's crystal structure), schorl is also called black tourmaline and is a member of the tourmaline group of minerals.

This beautiful specimen displays a well formed, lustrous, euhedral, single crystal which is mounted in a small display box with a label bearing the mineral name, chemical formula, and origin.

Dimensions & Specifications

Specific Gravity: 3.1-3.2
Hardness: 7
Material: Schorl [Na(Fe²⁺₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)]
Origin: Brazil