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Puninite

About

The first Na-dominant Cu oxosulphate of the locality; chemically somewhat resembling saranchinaite. Compare also euchlorine, wulffite, and parawulffite.

May be a representative of "euchlorine group"; the unit-cell parameter a of this group is very sensitive to the K/Na ratio.

Structurally related to euchlorine and fedotovite. As in the case of all other Cu oxysulphate minerals, the structure organizanion may be described via a “host–guest” principle. It consists, i.a., of [O2Cu6]8+ dimers. The dimers contact with four sulphate tetrahedra in a "face-to-face"; the remaining sulphate groups link the dimers in two dimensions.

Type Locality
Glavnaya Tenoritovaya fumarole (Major Tenorite), Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
Mineral Data
Na2Cu3O(SO4)3
Strunz: 
7.BC.20
Physical Properties
Colour: 
Emerald green
Crystal System: 
Monoclinic
Hardness: 
2 - 3