Minerals
Allanite
Members of this group are REE-rich minerals typified by the eponymous mineral allanite.Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
The valences on the key sites are: A1 = M2+, A2 = M3+, M1 = M3+, M2 = M3+, M3 = M2+, O4 = O2-, O10 = (OH)- (Armbruster et al., 2006). Some unnamed species are, however, thought to be dominantly oxidised, with M3 = M3+, balanced by O replacing OH.
A1=Ca, Mn2+
A2=Ce, La, Nd, Y
M1=Al, Fe3+, V
M2=Al, Cr?
M3=Fe2+, Mn2+, Mg
The valences on the key sites are: A1 = M2+, A2 = M3+, M1 = M3+, M2 = M3+, M3 = M2+, O4 = O2-, O10 = (OH)- (Armbruster et al., 2006). Some unnamed species are, however, thought to be dominantly oxidised, with M3 = M3+, balanced by O replacing OH.
A1=Ca, Mn2+
A2=Ce, La, Nd, Y
M1=Al, Fe3+, V
M2=Al, Cr?
M3=Fe2+, Mn2+, Mg
Colour: Black, with brownish reflections
Hardness: 5.5-6
Specific Gravity: 3.5 -4
Member: A group of the Epidote Supergroup
Crystal System: Monoclinic
Hardness: 5.5-6
Specific Gravity: 3.5 -4
Member: A group of the Epidote Supergroup
Crystal System: Monoclinic
Physical Properties
Luster:Vitreous
Luster:Vitreous
Transparency:Transparent, Translucent
Streak: Brown
Tenacity:Brittle
Cleavage: Imperfect/Fair along {001}
Fracture:Conchoidal
Streak: Brown
Tenacity:Brittle
Cleavage: Imperfect/Fair along {001}
Fracture:Conchoidal
Locality from ٖMuseum Sample
Kanada
Application
Kanada
Application
To extract rare elements and use it in industry
