Orange crystal aggregates of the very rare chromate mineral cassedanneite in two very small matrix specimens from the type locality in Russia (Berezovsk Mines, Ekaterinberg, Sverdlovsk Oblast, Russian Federation). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Cassedanneite
Cassedanneite is an IMA-recognized mineral species in the vanadate class, with the chemical formula Pb₅(VO₄)₂(CrO₄)₂·H₂O.
It crystallizes in the monoclinic crystal system.
Key properties: Mohs hardness 3.5; specific gravity 6.37; Yellow-orange streak; Resinous luster.
IMA symbol Cda, IMA status: approved, named in 1984.
On museum samples from the oxidized zone of gold-bearing quartz veins (Beresovsk, Russia).
It is found associated with Crocoite, embreyite, vauquelinite.
The mineral was named to honor Prof. Jacques P. Cassedanne (1923–), mineralogist, Institute of Geoscience, University of Rio de Janeiro, Rio de Janeiro, Brazil.