#metavoltine

[underthescopemineral]

Metavoltine

K2Na6Fe2+Fe3+6O2(SO4)12·18H2O

Locality:

Alcaparrosa Mine, Cerritos Bayos, Calama, El Loa Province, Antofagasta Region, Chile

Field of View: 2.5 mm

Orange Metavoltine “worms”. 

Collection and photo Stephan Wolfsried

Metavoltine is an alteration product of pyrite in arid climates; formed as a fumarolic sublimate and solfataric precipitate; may be a post-mining product. The name comes from the Greek μετά = “with” and voltaite, in allusion to the species’ original association with voltaite.  Partly soluble in water.

[wigmund]

From Mindat.Org Photo Of The Day; May 28, 2018:

Metavoltine: K2Na6Fe2+Fe3+6O2(SO4)12·18H2O

Locality: Alcaparrosa Mine, Cerritos Bayos, Calama, El Loa Province, Antofagasta Region, Chile

“Orange metavoltine "worms". Sony Alpha 7R ii, bellows, Mitutoyo M Plan 20x, aperture, Raynox DCR-250 retro, Stack-Master linear actor, stack shot control. Collection and Photo: Stephan Wolfsried”