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Tourmaline Var Chromium-dravite

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MGR765037

Tourmaline Var Chromium-dravite

Description Tabs

Description
Locality: 
Commander Mine, Nadonjukin, Simanjiro District, Manyara Region, Tanzania (United Republic)
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.1 × 1.1 × 1.2 cm
Description

Most likely the very best Chrom-Dravite in the world. This crystal represents the locality in the very best way. It shows superb luster, sharp termination, fine clarity and this wonderful intense green colour with intense yellow zones in the lower third.

Mineral Data
What's on the rock

Tourmaline

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

Chromium-dravite

Formula: 
Na(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
Group Parent: 
Tourmaline
Strunz: 
8/E.19-30
Crystal System: 
Trigonal
Hardness: 
7 - 7½
Colour: 
Dark emerald-green to greenish-black.
Streak: 
Greyish-green