Nice speciemen of callaghanite, a rare copper and magnesium carbonate, with a very characteristic cobalt blue colour. It shows a druse formed by numerous crystals. Accompanied by small orange-brown aggregates of pokrovskite, together with globules of hydromagnesite. It is accompanied by the Joan Viñals handwritten label.

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Callaghanite is an very rare copper magnesium carbonate, known from only a few localities worldwide. This specimen has bright royal-blue microcrystals and hails from the Type Locality in Nevada. Good size and rich sample.