Click on thumbnails for a larger image. Please be patient since some of these pages of thumbnail images take some time to load. These mineral photos are copyrighted by their owners and may not be used without permission.
Birnessite: (Na,Ca,K)x(Mn++++,Mn+++)2O4·1.5(H2O)
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