Hydrated arsenate containing hydroxyl, arthurite group
Specific gravity: 3.22
Hardness: 3½ to 4
Streak: White to pale brown
Colour: Yellowish brown to straw yellow
Cobaltarthurite is a secondary mineral.
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).
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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