This specimen comes from 5 květěn mine and contains 7.2 mm long massive aggregate of black Fe-Mo oxide kamiokite, with spots of yellow ferrimolybdite (to be examined soon) as well as fluorite (not to be seen here). Kamiokite is also covered by unspecified colorless microcrystals. The specimen was obtained from Jiri Spalek - thanks!
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Photo added: 27th Nov 2007