Rosenbergite

rosenbergite

gypsum

elpasolite

hydrokenoralstonite

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Formula: AlF[F_0.5(H₂O)_0.5]₄.H₂O
Fluoride
Crystal System: Tetragonal
Specific gravity: 2.1 measured, 2.111 calculated
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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