Specific gravity: 6.96 calculated
Colour: Colourless, pale yellow
Rosiaite is a very rare mineral.
The type locality is the Tafone Mine, Manciano, Grosseto Province, Tuscany, Italy.
At Le Cetine di Cotorniano Mine, Chiusdino, Siena Province, Tuscany, Italy, rosiaite occurs in an antimony deposit in highly silicified evaporites, associated with valentinite, tripuhyite and bindheimite (HOM, AM 82.208-209).
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