White crystal aggregates of brizziite, a very rare mineral with formula NaSb5+O3, that is found in only two localities worldwide, both in Tuscany. This is from Le Cetine Mine, Siena, Tuscany, Italy. — Photo: David Hospital · CC BY-SA 4.0
Brizziite
Brizziite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula NaSbO₃.
It crystallizes in the hexagonal crystal system (space group R-3). It is a member of the Corundum structural group.
Key properties: specific gravity 4.8; White streak; Pearly luster; optically uniaxial.
IMA symbol Bzi, IMA status: approved, named in 1993.
A weathering product of stibnite in an antimony deposit in highly silicified limestone.
It is found associated with Stibiconite, mopungite, cetineite, sénarmontite.
The mineral was named to honor Dr. Giancarlo Brizzi (1936–1992), mineral collector who discovered the first specimens.