Home Cordierite
VIII - Cyclosilicates
Crystal habit of Cordierite

Name   Cordierite
Chemistry   Mg2Al3[AlSi5O18]
Hardness   7
Lustre   greasy - vitreous
Colour   colourless, grey, violet, blue, brown
Streak   white 
Density [g/cm3]   2.6
Crystal habit   orthorhombic, crystals rarely, short columnar
Cleavage, Fracture   fracture conchoidal
other characteristics and occurrences   iolite = blue violet (gemstone variety)
metamorphic mineral, primarily in gneiss

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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