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Cordierite

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MCH150117

Cordierite

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Description
Locality: 
Bjordam Quarry, Bjordam, Bamble, Vestfold og Telemark, Norway
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 3.9 × 2.3 cm
Largest Crystal: 
2.00cm
Description

Sky-blue cordierite crystals are embedded in a matrix of quartz, mica and minor green coloured cordierite, halloysite (red) and a bit of anthophyllite.

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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