Zoisite var. Tanzanite (Bicolor)
Merelani Hills, Arusha Region, Tanzania
22mm x 17mm x 7mm
Unusual, triangular bicolor crystal of tanzanite. The yellow, upper portion has parallel internal dissolution tubes which give it a silky appearance. The gem-quality, purple lower portion is richly colored and clear; it shows fine dichroism with a bright blue color when viewed from the side. The crystal faces are lustrous; the parallel markings in the photo are internal.
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