Mineral: | Zoisite, Variety: Tanzanite
| Chemical Formula: | {Ca2}Al3}[O|OH|SiO4|Si2O7] | Size: | | Weight: | | Transparence: | transparent - translucent | Quantity: | | Origin: | Merelani Hills (Mererani), Umba Valley, Lelatema Mts, Arusha Region, Tanzania | Here you get a fine unheated Tanzanite crystal with great natural color. The crystal discloses a fine shape with termination and striation along the prism faces. You can see the pleochroism changing from light blue to violet coloration viewed along the c-axis. A fine example for a tanzanite crystal with partly gemmy areas!! 
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