305. Cordierite. Crystaline

Dana number

61.2.1.1

Chemical formula

(Mg,Fe2+)2Al3[AlSi5O18].H2O

Crystal class

Orthorhombic

Mohs hardness

7

Specific gravity

2.53-2.65

Collected in

Rosebud Station, Cloncurry, QLD, Australia

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