Outstanding blue wroewolfeite crystals associated to colorless sharp leadhillite crystals, green redgillite and also anglesite. From: Meadowfoot Smelter, Wanlockhead, Scotland, United Kingdom. — Photo: David Hospital · CC BY-SA 4.0
Wroewolfeite
Wroewolfeite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Cu₄(SO₄)(OH)₆·2H₂O.
It crystallizes in the monoclinic crystal system (space group Pc).
Key properties: Mohs hardness 2.5; specific gravity 3.27; Pale blue streak; Vitreous luster; optically biaxial.
IMA symbol Wwf, IMA status: approved, named in 1973.
Occurs as an uncommon secondary mineral in the oxidation zone of copper-bearing hydrothermal mineral deposits; may be post-mine or formed in dumps and in slags.
It is found associated with Langite, posnjakite, serpierite, brochantite, linarite, malachite, chalcocite, covellite.
The mineral was named to honor Professor Caleb Wroe Wolfe (1908–1980), American crystallographer, Boston University, Boston, Massachusetts, USA.