Home Heulandite
VIII - Tectosilicates (Zeolite Group)
Crystal habit of Heulandite Heulandite

Name   Heulandite
Chemistry   Ca[Al2Si7O18]·6H2O
Hardness   3.5 - 4
Lustre   vitreous - pearly
Colour   colourless, white, grey, yellow, green, orange
Streak   white 
Density [g/cm3]   2.2
Crystal habit   monoclinic, crystals tabular
Cleavage, Fracture   [110] distinct, fracture conchoidal to uneven
other characteristics and occurrences   in vesicles of volcanic rocks, especially basalts, also metamorphic formation and in deep sea sediments

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