Home Astrophyllite
VIII - Phyllosilicates		 Crystal habit of Astrophyllite Astrophyllite
 
Name   Astrophyllite
Chemistry   (K,Na)3(Fe2+,Mn)7(Ti,Zr)2[(O,OH)7|Si8O24]
Hardness   4.5 - 5
Lustre   adamantine - pearly
Colour   yellow, gold yellow, brown
Streak   yellowish brown
Density [g/cm3]   3.3 - 3.4
Crystal habit   tetragonal, crystals stabular, foliated, dipyramidal
Cleavage, Fracture   [001] perfect, fracture uneven
other characteristics and occurrences   in zirconium-bearing nepheline-syenites and granites
   
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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