Home Allanite
VIII - Sorosilicates (Epidote Group)		 Crystal habit of Allanite
 
Name   Allanite
(Orthite)
Chemistry   (Ce,Ca,Y)2(Al,Fe3+)3[OH|(SiO4)3]
Hardness   5.5
Lustre   vitreous - greasy
Colour   brown, reddish brown or black
Streak   greyish brown 
Density [g/cm3]   3.3  -3.7
Crystal habit   monoclinic, crystals prismatic or tabular
Cleavage, Fracture   [001], [100] imperfect, fracture conchoidal
other characteristics and occurrences   accessory mineral in acid magmatic rocks such as granites, syenites, diorites, in pegmatites as well as in metamorphic rocks (schists, limestone)
   
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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