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Chrysoberyl: BeAl2O4
Comments: Chrysoberyl (Alexandrite) crystal on matrix with excellent color change (Daylight, Tungsten Bulb). Location: Malyshevo, Yekaterina Oblast', Urals, Russia. Scale: Crystal size 1.2 cm. © Kevin Ward
Comments: Chrysoberyl (alexandrite) sixling twin crystal. Location: Zimbabwe. Scale: Crystal size 2.3 cm. © Richard Dale / Dale Minerals