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M'Passa, Republic of the Congo
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Chalcosine, M’passa, Republic of the Congo. A 3.5 × 3 × 2.5 cm specimen of rough chalcosine; the M’passa deposit has yielded high-quality chalcosine crystals. This specimen was obtained through an exchange with the SCEM at the BRGM in Orléans in the 1980s.