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Dravite crystal exhibiting the "Usambara effect" color change (named after nearby mountains) / Nchongo, Umba Valley, Tanzania
Azurite crystals changing to malachite.
Pallasite - a variety of Meteorite that has olivine crystals embedded inside a nickel iron matrix. From Esquel, Argentina #minerals #rocks #crystal
Tanzanite / Merelani Hills, Lelatema Mtns., Arusha Region, Tanzania
crystal within crystal