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Formula: CaCu4(SO4)2(OH)6.3H2O
Hydrated sulphate containing hydroxyl, devilline group
Crystal System: Monoclinic
Specific gravity: 3.084 measured, 3.13 calculated
Hardness: 2½
Streak: Light green
Colour: Dark emerald green to bluish green
Solubility: Insoluble in water and concentrated sulphuric acid, soluble in nitric acid
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).
Localities
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, UK, 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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