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Sapphirine supergroup
[ A
4
][B
12
][O
4
|T
12
O
36
]
A: [ 2+: Mg, Fe, Ca, Sr ][ 1+: Na, K ]
B: [ 5+: Sb, As ][ 4+: Ti, Sn ][ 3+: Al, Fe, Cr, V, Ti, Ga, Mn ][ 2+: Mg, Mn, Fe, Zn]
T: [ 4+: Si, Ge ][ 3+: Al, Fe, Be ]
[ A ]
[ Mg ]:
Sapphirine group
[ Na ]:
Aenigmatite group
[ Ca ]:
Rhönite group
, Rhonite group
[ Fe ]: Unnamed
Surinamite
Class:
Ino-Aluminosilicate
,
Inosilicate
System: Monoclinic