Verdelite - Green variation of Tourmaline (Cr-traces) Cyclosilicates Na(Li,Al,Mg,Mn,Fe)3Al6(BO3)3[Si6O18](OH)4 Minas Gerais, Brazil Size: 8 cm Schorl - Black variation of Tourmaline (Fe-traces) Cyclosilicates Na(Li,Al,Mg,Mn,Fe)3Al6(BO3)3[Si6O18](OH)4 Minas Gerais, Brazil & United Kingdom Size: (Left) 4cm / (Middle) 9 cm / (Right) 3 cm Rubellite - Pink variation of Tourmaline (Mn-traces) Cyclosilicates Na(Li,Al,Mg,Mn,Fe)3Al6(BO3)3[Si6O18](OH)4 Minas Gerais, Brazil Size: 18x13 cm Indicolite - Blue variation of Tourmaline (Li-traces) Cyclosilicates Na(Li,Al,Mg,Mn,Fe)3Al6(BO3)3[Si6O18](OH)4 Minnesota, USA Size: 7 cm Zoned blue-yellow Fluorite Halides CaF2 Illinois, USA Size: 10 cm Zoned green-purple Fluorite Halides CaF2 Illinois, USA Size: 9 cm Purple Fluorite Halides CaF2 Kansas, USA Size: 12cm Green Fluorite Halides CaF2 Hebei, China Size: 8x7 cm Yellow Fluorite CaF2 Hebei, China Size: 21cm Ruby (red variety of Corundum) in Zoisite Oxides Al2O3 Burma Size: (Top) 26cm