Colorful yellow crystals of the rare copper-iron sulphate mineral poitevinite in small pieces of matrix. From: Cumobabi, La Verde District, Sonora, Mexico. — Photo: David Hospital · CC BY-SA 4.0
Poitevinite
Poitevinite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Cu(SO₄)·H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 3–3.5; specific gravity 3.3.
IMA symbol Pvi, IMA status: approved, named in 1963.
A rare secondary mineral found in the oxidized zone of a base-metal hydrothermal mineral prospect.
It is found associated with Quartz, gypsum, pyrite, bonattite, scorodite.
The mineral was named to honor Dr. Theophile Eugène Poitevin (1888–1978), Canadian mineralogist, Geological Survey of Canada.