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Tourmaline

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MGR562106

Tourmaline

Description Tabs

Description
Locality: 
Otjua Mine, Otjua Farm 37, Karibib, Erongo Region, Namibia
Class: 
Single Crystal
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.7 × 4.3 × 0.3 cm
Description

A complex granitic pegmatite known primarily for its production of polychrome elbaite tourmaline. This locality is not in the Kunene Region. It should not be confused with the Otjua tungsten deposit. There are no relevant new discoveries, the specimen is decades old. It shows a wonderful blue core, sorrounded by a colorless area with a light pink sharp zone and finally dark green along the edges of the slice. Excellent transparency, like glass. Well cut and polished.

Mineral Data
What's on the rock

Tourmaline

Formula: 
A(D3)G6(T6O18)(BO3)3X3Z
Crystal System: 
Trigonal
Hardness: 
7