Pandoraite-Ca
Pandoraite-Ca is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula CaV⁴⁺₅V⁵⁺₂O₁₆·3H₂O.
It crystallizes in the monoclinic crystal system (space group P2). It is a member of the Pandoraite structural group.
Key properties: Mohs hardness 2.5; specific gravity 2.91; Light greenish blue streak; Vitreous luster; optically uniaxial.
IMA symbol Pdo-Ca, IMA status: approved, named in 2018.
Deposited from solutions rich in U and V where they encountered pockets of strongly reducing solutions developed around accumulations of carbonaceous plant material.
It is found associated with Finchite.
The name refers to the mine where it was discovered, and a suffix indicates the dominant interlayer cation.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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