Russoite
Russoite is an IMA-recognized mineral species in the arsenate class, with the chemical formula (NH₄)ClAs₂O₃(H₂O)₀.₅.
It crystallizes in the hexagonal crystal system (space group P622).
Key properties: specific gravity 2.89; White streak; Vitreous luster; optically uniaxial.
IMA symbol Rso, IMA status: approved, named in 2015.
Found as a sublimate around a volcanic fumarole.
It is found associated with Alacránite, dimorphite, realgar, mascagnite, salammoniac, amorphous arsenic sulfide.
The mineral was named to honor Dr. Massimo Russo (b. 1960), the Vesuvius Observatory, National Institute of Geophysics and Volcanology, Naples.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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