Sky blue crystals of the very rare Mn-Cu sulphate from one of the very few known localities worlwide: Richfield, Sevier County, Utah, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Campigliaite
A copper-manganese sulfate hydrate sharing its structure with niedermayrite, with manganese in place of cadmium.
Intro adapted from Wikipedia (CC BY-SA).
Campigliaite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Cu₄Mn²⁺(SO₄)₂(OH)₆·4H₂O.
It crystallizes in the monoclinic crystal system (space group C2). It is a member of the Devilline structural group.
Key properties: specific gravity 3; Vitreous luster; refractive index 1.631; optically biaxial.
IMA symbol Cpg, IMA status: approved, named in 1981.
A rare secondary mineral found in the oxidized zone of a metallic sulfide skarn deposit.
It is found associated with Gypsum, brochantite, antlerite.
The name is derived from the locality which provided the first specimens, Campiglia Marittima, Italy.