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Fluor-dravite Phlogopite & Corundum

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RHT598746

Fluor-dravite Phlogopite & Corundum

ex Gunnar Färber Mineralien
Analysed

Description Tabs

Description
Locality: 
Koksha Valley, Badakhshan Province, Afghanistan
Class: 
Combination
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 4.1 × 4 cm
Largest Crystal: 
1.20cm
Description

We were lucky to get one of the newly analysed fluor-dravite specimen, before they were first presented at the Sainte-Marie show. It's one of the better specimen with three dark blue fluor-dravite crystals up to 1.2 cm on a mica (phlogopite and other) matrix with a few lighter blue, corundum (sapphire) grains. There won't be many specimen coming to the market.
 

Mineral Data
What's on the rock

Fluor-dravite

Formula: 
Na(Mg3)Al6(Si6O18)(BO3)3(OH)3F
Strunz: 
9.CK.05
Hardness: 
7.0 - 0.0
Type Locality: 
Crabtree Mine (Big Crabtree Emerald Mine), Spruce Pine, Spruce Pine District, Mitchell Co., North Carolina, USA

Phlogopite

Formula: 
KMg3(AlSi3O10)(OH,F)2
Strunz: 
9.EC.20
Crystal System: 
Monoclinic - Prismatic
Hardness: 
2.0 - 3.0
Streak: 
White

Corundum

Formula: 
Al2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
9.0
Streak: 
White
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