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Tourmaline Var Dravite

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BMM529317

Tourmaline Var Dravite

Description Tabs

Description
Locality: 
Mwajanga, Simanjiro District, Manyara Region, Tanzania (United Republic)
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 0.8 × 0.7 cm
Description

Facet quality single crystal, gemmy yellow brown coloration. With slight chipping along edges, excellent transparency. Selfstandig, photo 1, 3 and 4 with backlit.

Mineral Data
What's on the rock

Tourmaline

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

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