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Formula: Mn2+3Fe3+4(PO4)4(OH)6(H2O)2
Phosphate, manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.40 calculated
Hardness: 4 to 5
Streak: Light brown
Colour: Brown
Luminescence: Not fluorescent under UV
Environments
Pegmatites
Hydrothermal environments
Kenngottite is a relatively new mineral, approved in 2019.
Localities
At the type locality, the Stannum mine, Huber stock, Krásno, Sokolov District, Karlovy Vary Region, Czech Republic,
kenngottite occurs in association with phosphosiderite,
fluorapatite, manganese-rich
dufrénite, frondelite,
rockbridgeite, morinite,
beraunite, strengite,
natrodufrénite, fluorite and
a potassium-manganese oxide. It forms brown aggregates up to 3 mm across in tiny cavities of hydrothermally altered
black rockbridgeite-group minerals. These aggregates are composed of
imperfect laths to fibrous crystals up to 0.5 mm in size
(EJM 31.629-636).
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