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Cordierite Var Iolite

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PDM757665

Cordierite Var Iolite

Description Tabs

Description
Locality: 
Babati District, Manyara Region, Tanzania (United Republic)
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.1 × 2.5 × 1.8 cm
Description

Gemmy cordierite (variety iolite) with strong pleochroism, from purple blue to golden yellow by turning the piece 90°. Interestingly it is composed of stepped crystal faces, which is uncommon for both species and locality.

Found in 2010.

Mineral Data
What's on the rock

Iolite

Variety Of: 

Cordierite

Formula: 
(Mg,Fe)2Al3(AlSi5O18)
Strunz: 
9.CJ.10
Hardness: 
7.0 - 7.5
Hardness: 
0.0

Cordierite

Formula: 
(Mg,Fe)2Al3(AlSi5O18)
Strunz: 
9.CJ.10
Crystal System: 
Orthorhombic
Hardness: 
7.0 - 7.5
Type Locality: 
Großer Arber, Bayerisch Eisenstein, Lower Bavaria, Bavaria, Germany

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