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Epidote supergroup
[ A
2
][ M
3
][ X | Y |SiO
4
|Si
2
O
7
]
A1: [ 2+: Ca, Mn ]
A2: [ 4+: Th, U ][ 3+: REE ][ 2+: Ca, Sr, Pb ]
M: [ 3+: Al, Fe, Mn, Cr, V ][ 2+: Mg, Fe, Mn ]
X: [ 2-: O ][ 1-: OH ]
Y: [ 2-: O ][ 1-: F ]
[ A
2
][ M
3
][ Y ]
[ A
2+
B
2+
][ L
3+
M
3+
N
3+
][ O ]:
Epidote group
[ A
2+
REE
3+
][ L
3+
M
3+
N
2+
][ O ]:
Allanite group
[ A
2+
REE
3+
][ L
2+
M
3+
N
2+
][ F ]:
Dollaseite group
Class:
Sorosilicate
-
Nesosilicate
-
Oxide
-
Hydroxide
System: Monoclinic