tourmalines
cyclosilicate mineral supergroup
rubellite
red gemstone quality Li-rich and more or less (Fe+Mg)-free tourmaline variety
oxy-vanadium-dravite
tourmaline, cyclosilicate mineral
fluor-schorl
tourmaline mineral
oxy-schorl
tourmaline mineral
Paraiba Tourmaline
gemstone
dravite
cyclosilicate, tourmaline mineral
fluor-dravite
tourmaline mineral
schorl
tourmaline, cyclosilicate mineral
chromium-dravite
cyclosilicate, mineral
oxy-dravite
tourmaline mineral