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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).
Devilline from Spania Dolina - Image
At the Tynebottom mine, Cumbria, England, UK, devilline is intergrown with
serpierite, and sometimes
surrounded by
brochantite
(JRS 10.3-9) .
Devilline from the Tynrbottom Mine -
Image
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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