schorl  search
BTsilicates
 .ring silicates
 ..schorl
RTdravite
 buergerite
 tourmaline
 elbaite
SNForms a series with dravite.
schorlomite  search
BTsilicates
 .orthosilicates
 ..nesosilicates
 ...garnet group
 ....schorlomite