Ziesite

ziesite

stoiberite

shcherbinaite

bannermanite

Images

Formula: Cu2V5+2O7
Anhydrous normal vanadate, paramorph of blossite
Specific gravity: 3.86
Streak: Red-brown
Colour: Black
Luminescence: Non-fluorescent
Environments

Fumeroles

Ziesite occurs in fumeroles, and is stable above 712oC.

Localities

The type locality, the Izalco Volcano, Sonsonate Department, El Salvador, is a basaltic composite cone which has been active intermittently since its birth in 1270. Copper and vanadium are distinctive elements in the minerals of the fumarolic suite, that includes chalcocyanite, chalcanthite, shcherbinaite and stoiberite.
Ziesite occurs as equant black anhedral crystals less than 200 microns in size, as an incrustation coating basaltic breccia fragments about 1 m below the surface. Associated minerals include stoiberite, shcherbinaite, bannermanite, fingerite, mcbirneyite, blossite, chalcocyanite and chalcanthite (AM 65.1146-1149, HOM).

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