More to explore:
Dravite crystal exhibiting the "Usambara effect" color change (named after nearby mountains) / Nchongo, Umba Valley, Tanzania
“Valley of the Crystals”
Zoisite var. Tanzanite from Merelani Hills, Umba Valley, Arusha District, Tanzania. www.irocks.com/...
Dravite from Namalulu, Tanzania
Large gem Tanzanite crystal, Merelani Hills, Umba Valley, Lelatema Mts, Arusha Region, Tanzania.
Azurite crystals changing to malachite.
Tanzanite / Merelani Hills, Lelatema Mtns., Arusha Region, Tanzania