Ojuelaite Locality: Christiana Mine, Kamariza Mines (Kamareza Mines), Agios Konstantinos [St Constantine] (Kamariza) , Lavrion District Mines, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece ( Locality at mindat.org ) Green Ojuelaite from the Christiana Mine, Kamareza Mines, Lavrion, Greece. Field of view 4 mm. SEM-EDX analysis by S.Möckel. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Ojuelaite
Ojuelaite is an IMA-recognized mineral species in the arsenate class, with the chemical formula ZnFe³⁺₂(AsO₄)₂(OH)₂·4H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Arthurite structural group.
Key properties: Mohs hardness 3; specific gravity 3.39; Pale yellow streak; Silky to vitreous luster; optically biaxial.
IMA symbol Ojl, IMA status: approved, named in 1979.
A rare mineral found in the oxidized zone of arsenic-rich polymetallic hydrothermal ore deposits.
It is found associated with Paradamite, scorodite, smithsonite, “limonite” (Ojuela mine, Mexico); smithsonite, tennantite, goethite (Tsumeb, Namibia).
The name refers to the Ojuela mine, Mexico, in which the first specimens were found.