The main salon of the hotel barge Prospérité run by Elegant Waterways. — Photo: Summerrobertson · CC BY-SA 4.0
Prosperite
Prosperite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₂Zn₄(AsO₄)₄·H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 4.5; specific gravity 4.31; White streak; Vitreous to silky luster; optically biaxial.
IMA symbol Ppe, IMA status: approved, named in 1978.
Found as a rare secondary mineral in partly altered sulfide ore from a dolostone-hosted hydrothermal polymetallic ore deposit.
It is found associated with Tennantite, chalcocite, mercurian silver, cuprite, cuprian adamite, cuprian austinite, conichalcite, stranskiite, lavendulan, köttigite, tsumcorite.
The mineral was named to honor Prosper John Williams (1910–), of Toronto, Canada, South African-Canadian mineral dealer, supplier of many Tsumeb specimens.