Kusachiite is an extremely rare binary copper(II) and bismuth(III) oxide with a chemical formula CuBi₂O₄. This sample belongs from the Type Locality: the well-known Fuka mine in Japan.This sample is rich in radial aggregates of kusachiite crystals, with a deep brown to black colour and contasting on the matrix. They are accompanied by calcite, quartz and other species like cahnite (SEM), bismite and chiyokoite (A. Petrov confirmed). We have carried out some SEM-EDS analysis and Raman. With these spectroscopical techniques we have confirmed the presence of the species. We will send all analytical reports to the buyer. 5x85o

350 €

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