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Tourmaline Var Dravite

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MGR191074

Tourmaline Var Dravite

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Description
Locality: 
Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy
Size Range: 
Cabinet (10-18 cm)
Size: 
13.4 × 11.4 × 2.9 cm
Description

For a Tourmaline collector this might be of relevance. And for the locality it is simply outstanding. The crystals are imbedded in Muscovite. The crystals are very sharp, the faces are plane not stepped and very lustrous. It was very hard to photograph because of uncountable reflexions on Muscovite matrix. The quality of Dravite is much better in person!!! This material is very rare and the dimension and quality is fantastic for Val Ossola, this is great classic!

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
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