English: Dark violet crystal aggregates of joannneumite (IMA 2012-001), from Pabellon de Pica, Chanabaya, Iquique Province, Tarapacá Region, Chile. The mineral is a chemical oddity because is a mixture of two organic compounds (ammine-cianurate) and an inorganic compound (copper). It is the first organometallic mineral in Nature. Associated mineral is pale blue greenish salammoniac, on grandodiorite matrix.
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