Devilline - Encyclopedia
Class : Sulfates, chromates, molybdates
Subclass : Hydrated sulfates
Crystal system : Monoclinic
Chemistry : CaCu4(SO4)2(OH)6 3H2O
Rarity : Uncommon
Devilline (or devillite) is a hydrated sulfate from the oxidation zone of copper deposits. It is also found in neo-formation in slags. It was named in honor of the French chemist Henri Etienne Sainte-Claire Deville, inventor of the first industrial aluminum manufacturing process. It forms six-sided lamellar to acicular crystals, united in rosettes or encrustations, white in color or various shades of green and blue.
Main photo : Devilline from Spania Dolina, Banská Bystrica, Slovakia © Martin Stevco
Devilline in the World
Twinning
A twin is known on {010}.
Fakes and treatments
No fakes listed for this mineral species.
Hardness : 2.5
Density : 3.08 to 3.13
Fracture : Undetermined
Streak : Light green
TP : Transparent
RI : 1.585 to 1.660
Birefringence : 0.075
Optical character : Biaxial -
Pleochroism : Visible
Fluorescence : None
Solubility : Nitric acid
Magnetism : None
Radioactivity : None