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Dravite With Sapphire

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KRM692493

Dravite With Sapphire

Description Tabs

Description
Locality: 
Koksha Valley, Badakhshan Province, Afghanistan
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 9 × 9 cm
Description

A large well doubly perfectly  terminated dravite-uvite tourmaline hosts to greenish micaceous matrix   , These materials were formerly known as indicolite , new reaserch (by Ian Nicastro)  shows  are actiually  dravite-uite tourmaline  , Nice perfect dravite-uvite tourmaline  specimen from seller's personal collection .

Gems & Gemmology , issue Winter 2016

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

Sapphire

Variety Of: 

Corundum

Formula: 
Al2O3
Strunz: 
4.CB.05
Hardness: 
9.0
Formula: 
Al2O3
Hardness: 
0.0
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