Rosenbergite

rosenbergite

gypsum

elpasolite

hydrokenoralstonite

Images

Formula: AlF[F0.5(H2O)0.5]4.H2O
Normal halide
Specific gravity: 2.1
Hardness: 3 to 3½
Streak: Colourless
Colour: Colourless
Environments

Chemical sedimentary environments
Fumeroles

Rosenbergite is a very rare mineral.

Localities

In the crater of Mount Erebus, Ross Island, Antarctica rosenbergite has been found as a volcanic sublimate in fumeroles associated with gypsum (HOM, Dana).

At the type locality, Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy, rosenbergite has been found in cavities in a highly silicified limestone associated with gypsum, fluorite, elpasolite, hydrokenoralstonite and onoratoite (AM 79.765).

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