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X-vacant-tourmaline group
[ [] ][ Y3 ][Al6][(OH)3|W|(BO3)3|(SiO3)6]
- Vacant-subgroup 1: [ Y2+2Y3+ ]
- Foitite
- Magnesiofoitite
- Oxy-foitite
- Vacant-subgroup 2: [ Y+Y3+2 ]
- Rossmanite
- Vacant-subgroup 3: [ Y2+Y3+2 ]
- No member
- Vacant-subgroup 4: [ Y+0.5Y3+2.5 ]
- No member