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Formula: Cu(C3N3O3H2)2(NH3)2
Valence: Cu(C3N3O3H2)2(N3-H3)2
Organic compound. The ammine complex is metal in complex with NH3. As of
September 2023 there were five known ammine complex bearing minerals, joanneumite,
chanabayaite, shilovite,
ammineite and triazolite
(Mindat).
Crystal system: Triclinic
Specific gravity: 2.020 calculated
Hardness: 1
Streak: Pale violet
Colour: Violet
Luminescence: No fluorescence under UV
Common impurities: Zn
Environments
Joanneumite was approved in 2012 and to date (March 2026) it has been reported only from the type locality.
Localities
At the type locality, Pabellón de Pica, Chanabaya, Iquique, Iquique Province, Tarapacá, Chile, joanneumite
was found as microcrystalline aggregates up to 2 mm in size, formed in cracks in
gabbro by the convergence of solutions derived from the oxidation of
disseminated copper mineralisation and nitrogen-rich guano in an arid region.
Associated minerals include salammoniac,
dittmarite, möhnite,
gypsum, chanabayaite and
antipinite
(HOM).
Joanneumite from Pabellón de Pica -
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