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Hackmanite

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BNG970617

Hackmanite

Fluorescent

Description Tabs

Description
Locality: 
Koksha Valley, Badakhshan Province, Afghanistan
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2.1 × 1.7 cm
Description

A very nice fluorescent hackmanite  crystal from Afghanistan. Hackmanite is unusual because it exhibit optical property know as  tenebrescence a type of reversible photochromism.

Mineral Data
What's on the rock

Hackmanite

Variety Of: 

Sodalite

Formula: 
Na8(Al6Si6O24)Cl2
Strunz: 
9.FB.10
Hardness: 
5.5 - 6.0
Formula: 
Na8Al6Si6O24(Cl2,S)
Hardness: 
0.0

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