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Formula: CaFe3+4(PO4)2(OH)8.4-5H2O
Hydrated phosphate containing hydroxyl
Crystal System: Amorphous
Specific gravity: 1.85 measured
Hardness: 2½
Streak: Yellow, pale brown
Colour: Yellowish brown, brownish black, reddish, chestnut-brown
Environments
Associated minerals include diadochite,
vivianite, pitticite,
melanterite and limonite
(HOM).
The type locality is the Château de Berneau, Dalhem, Liège, Wallonia, Belgium.
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