Tanzanite on Calcite - Karo Mine, Arusha, Tanzania
 
 Specimen with several sharp-edged tanzanites up to 1.9 cm in lenght and partly in calcite. Tanzanite specimens are very rare to get! The specimen is overgrown with graphite and yellowish-green diopsites can also be found. Extremely aesthetic and richly occupied piece. The characteristic trichroism, which moves between blue and purple in the play of colors, is well visible in this untreated piece. Rare and highly aesthetic collector's piece.