Cobaltlotharmeyerite Locality: Aghbar Mine (Arhbar Mine), Aghbar, Bou Azzer District, Tazenakht, Ouarzazate Province , Souss-Massa-Draâ Region, Morocco ( Locality at mindat.org ) Analysed specimen. Field of view 3 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Cobaltlotharmeyerite
Cobaltlotharmeyerite is an IMA-recognized mineral species in the arsenate class, with the chemical formula CaCo₂(AsO₄)₂·2H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Natrochalcite structural group.
Key properties: Mohs hardness 4.5; specific gravity 4.2; Light brown streak; Vitreous luster; optically biaxial.
IMA symbol Clmy, IMA status: approved, named in 1997.
Found in the oxidation zone of polymetallic ore deposits.
It is found associated with Alumopharmacosiderite, bariumpharmacosiderite, arseniosiderite, zeunerite, olivenite, rooseveltite (Rappold and Pucher mines); Co- and Ni-bearing mawbyite.
The prefix, cobalt, indicates the cobalt analog of lotharmeyerite.