Home Arfvedsonite
VIII - Inosilicates (Amphibole Group)
Crysta habit of Arfvedsonite

Name   Arfvedsonite
Chemistry   Na2,5Fe2+4Fe3+[(OH)|Si4O11]2
Hardness   5.5 - 6
Lustre   vitreous
Colour   greenish black, dark blue, grey
Streak   bluish grey 
Density [g/cm3]   3.1 - 3.5
Crystal habit   monoclinic, crystals prismatic, acicular, radiating, tabular
Cleavage, Fracture   [110] perfect (124°), fracture uneven to conchoidal
other characteristics and occurrences   in alkali rich plutonic rocks with high concentration of iron (nepheline-syenite) and pegmatites, rarely in metamorphic schists

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