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These mineral photos are copyrighted by their owners and may not be used without permission.
Comments: Gray birnessite. Very small crystals on massive material.
Location: Das Aufgeklärte Glück Mine, Hasserode, Wernigerode, Harz Mts, Saxony-Anhalt, Germany.
Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag
Birnessite: (Na,Ca,K)x(Mn++++,Mn+++)2O4·1.5(H2O) Buserite:
Comments: Round, "rabbit pellets" of buserite which dehydrates to birnessite when dry. Image photographed through water which is needed to preserve this species.
Location: Aomori Springs, Oppu, Japan.
Scale: Sphere size 7 mm.
© Dave Barthelmy