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Tourmaline supergroup [abbr. Alm ]
Year of discovery: 1885 (Japan)
Locality list: 696 localities of tourmaline
- [ X ][Y3][Z6][V3|W|(BO3)3|(TO3)6]
- X: [ 2+: Ca ][ 1+: Na, K ][ 0: [] ]
- Y: [ 4+: Ti ][ 3+: Al, Fe, Cr, V ][ 2+: Fe, Mg, Mn, Zn, Ni, Co, Cu ][ 1+: Li ]
- Z: [ 3+: Al, Fe, Cr, V ][ 2+: Mg, Fe ]
- T: [ 4+: Si ][ 3+: Al, B ]
- V: [ 2-: O ][ 1-: OH ]
- W: [ 2-: O ][ 1-: OH, F ]