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IV - Oxides
Crystal habit of Samarskite Samarskite

Name   Samarskite
Chemistry   (Y,Er)4[(Nb,Ta)2O7]3
Hardness   5 - 6
Lustre   vitreous - resinous
Colour   black, brownish, yellowish brown
Streak   reddish brown 
Density [g/cm3]   5.6 - 5.8
Crystal habit   orthorhombic, crystals prismatic, striated
Cleavage, Fracture   fracture conchoidal
other characteristics and occurrences   in pegmatites, important raw material for niobium, tantalum, yttrium, some varieties contain up to 23% uranium

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