Kenngottite

kenngottite

phosphosiderite

dufrenite

rockbridgeite

Images

Formula: Mn2+3Fe3+4(PO4)4(OH)6(H2O)2
Phosphate, manganese-bearing mineral
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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