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Formula: CoFe3+2(AsO4)2(OH)2.4H2O
Hydrated arsenate containing hydroxyl,
arthurite group,
cobalt-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.22 measured
Hardness: 3½ to 4
Streak: White to pale brown
Colour: Yellowish brown to straw yellow
Environments:
Cobaltarthurite is a secondary mineral.
Localities
At Khder, Bou Azzer, Morocco, cobaltarthurite occurs in cavities in löllingite ore associated with
arseniosiderite, scorodite
and karibibite
(MinRec 38.5.367).
At Oumlil-East, Bou Azzer, Morocco, cobaltarthurite occurs in vein rock associated with
karibibite and parasymplesite
(MinRec 38.5.367).
Cobaltarthurite from Oumlil - Image
At the type locality at the Dolores prospect in Murcia, Spain, cobaltarthurite occurs is associated with
olivenite and jarosite.
(Dakota matrix minerals https://www.dakotamatrix.com/mineralpedia/8655/cobaltarthurite).
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