Sulfates: Devillin
Diagnostic Card.
Ca Cu 4 (SO 4)2 (OH) 6 * 3 (H 2 O)
Crystal system monoclinic
2.5 Hardness
Specific gravity 3.1
Cleavage is perfect
fracture conchoidal
Color emerald green
Color in light green powder
Gloss glass
It occurs in the form of crusts, needle-like fan-shaped aggregates, rosettes plate crystals. The color of emerald and blue-green.
Another hydrated alkaline copper sulphate and calcium containing zinc also called serpierit. He orthorhombic system, occurs in the form of crusts, and aggregates of elongated bundles of needles to the sky-blue color.
Diagnostic features.
Devillin not soluble in water but is soluble in nitric acid. When heated does not melt, but gives white smoke and crackling. Serpierit dissolves in water.
Origin.
Devillin and serpierit are rare secondary minerals of some deposits of copper, which are found in association with gypsum, azurite and malachite.
Place of Birth.
Devillin originally discovered in Cornwall, was also observed in Herrengrunde (Czech Republic), in Vezani in Corsica, in Acton Copper Mine in Pennsylvania (USA). Serpierit with smithsonite found on Ross Island in Ireland, in Lavrion (Greece), and together with linaritom and tsianotrihitom - in Kazakhstan.
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