4pcs Glossy Straight Black TOURMALINE Crystal

4pcs Glossy Straight Black TOURMALINE Crystal

**specification**

2012.03.17

1.6 x 0.5 x 0.5 inch

1.2 x 0.5 x 0.3 inch

45g

Altay Mine, Xinjiang Province* China

Tourmaline mineral group is chemically one of the most complicated groups of silicate minerals.It belongs to the trigonal crystal system and occurs as long, slender to thick prismatic and columnar crystals that are usually triangular in cross-section. Interestingly, the style of termination at the ends of crystals is asymmetrical, called hemimorphism.Tourmaline has a wide variety of colors. Usually, iron-rich tourmalines are black to bluish-black to deep brown, while magnesium-rich varieties are brown to yellow, and lithium-rich tourmalines are practically any color: blue, green, red, yellow, pink etc.

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