Hydrated sulphate containing hydroxyl, devilline group
Specific gravity: 3.13
Hardness: 2½
Streak: Light green
Colour: Dark emerald green to bluish green
Solubility: Insoluble in water and concentrated sulphuric acid, soluble in nitric acid

Hydrothermal environments

Devilline is an uncommon secondary mineral in the oxidised portions of copper sulphide deposits; it may be of post-mining origin in dumps and on timbers. Associations: langite, antlerite, brochantite, posnjakite, linarite, malachite, azurite and gypsum (HOM).
At Vezzani, Corsica, France, devilline occurs in stalctites with spangolite (Dana).
At Spania Dolina, Slovakia, devilline occurs with gypsum, azurite and malachite (Dana).
At the Tynebottom mine, Cumbria, England, devilline is intergrown with serpierite, and sometimes surrounded by brochantite (JRS 10.3-9) .
At the Gallagher Vanadium property and Manila mine, Cochise county, Arizona, USA, devilline is associated with gypsum and brochantite (R&M90.4.342).

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