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Cordierite

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PDM716200

Cordierite

Description Tabs

Description
Locality: 
Timms Hill, Haddam, Middlesex County, Connecticut, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.2 × 1.9 × 1.6 cm
Description

Gemmy cordierite (variety iolite) with strong pleocroism, from purple-blue to golden yellow by turning the piece 90°. Uncommon locality in collections. Acquired in 1977 to J. Hardman; Ex René Virlet specimen.

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

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