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Single Dravite floater crystal exhibiting the "Usambara" color change effect. From Nchongo, Umba Valley, Tanzania Minerals Crystals Rocks, Dravit Floater, Crystals Minerals Gemstone, Usambara Colors, Single Dravit, Colors Changing, Rocks Crystals Minerals, Floater Crystals, Crystals Exhibitions
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Dravite crystal exhibiting the "Usambara effect" color change (named after nearby mountains) / Nchongo, Umba Valley, Tanzania
Large gem Tanzanite crystal, Merelani Hills, Umba Valley, Lelatema Mts, Arusha Region, Tanzania.