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Cordierite Var Iolite

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PDM577049

Cordierite Var Iolite

Gem Crystal

Description Tabs

Description
Locality: 
Belemboka, Tsihombe, Androy, Madagascar
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
1.8 × 1.6 × 0.8 cm
Description

From a 2013 find in an old deposit at (Belemboka, Madagascar), a gemmy cordierite (variety Iolite), with some yellow-red internal reflections, probably doe to inclusions of iron hydr(oxides). It displays a strong pleocroism, from intense purple-blue to golden yellow, by every 90° turn of the piece. Rarely seen uncut in the market.

Mineral Data
What's on the rock

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

Iolite

Variety Of: 

Cordierite

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

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