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Dravite Var Tourmaline

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BMM606853

Dravite Var Tourmaline

Description Tabs

Description
Locality: 
Mwajanga, Simanjiro District, Manyara Region, Tanzania (United Republic)
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 1.5 × 1.2 cm
Description

Dravite with gemmy, yellow brown coloration. With slight chipping along the edges, excellent trans-parency. Photo 1 and 2 with moderate LED backlit. The specimen stands in this position without any help.

Mineral Data
What's on the rock

Dravite

Formula: 
Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Crystal System: 
Trigonal
Hardness: 
7.0
Type Locality: 
Dobrova, Dravograd (Unterdrauburg), Slovenia

Tourmaline

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