Hydrated sulphate, picromerite group
Specific gravity: 2.028
Colour: Colourless, white, reddish, yellowish, greyish, colourless in transmitted light
Solubility: Soluble in water
Fresh picromerite is colourless. Specimens may dehydrate to white, opaque
Picromerite principally occurs in oceanic bedded salt deposits, as a volcanic sublimate in fumaroles and in a
sulphate-rich hydrothermal ore deposit. In oceanic salt deposits associated minerals include
kainite and epsomite
At the Chuquicamata mine, Chuquicamata District, Calama, El Loa Province, Antofagasta, Chile, picromerite is associated with hohmannite, metavoltine and metasideronatrite (HOM).
At the type locality, Mt Vesuvius, Somma-Vesuvius Complex, Naples, Campania, Italy, picromerite occurs in active volcanic fumaroles (Mindat).
Back to Minerals