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Carrollite, meneghinite and bournonite are rare minerals in the Kuroko deposits, and occur in very restricted parts of the uppermost part of the black ore zone. Carrollite is found exclusively in a chalcopyrite rich part of the black ore of the Matsumine ore deposit of the Hanaoka mine. The mineral is intimately associated with chalcopyrite, bornite and pyrite and also with sphalerite (0.2-0.3 wt% Fe), tennantite, galena and barite. Meneghinite, bournonite and boulangerite are found in the black ore from the Uwamuki ore deposits of the Kosaka mine. Moreover, at the Uwamuki No. 3 ore deposit, euhedral crystals of meneghinite and bournonite occur in cavities of the black ore, and are closely associated with barite and sphalerite (0.10 wt% Fe, below 0.01 wt% Mn, 0.17 wt% Cd). Mode of occurrence and mineralogical data of these rare minerals are described in this paper and the brief discussion for the mineral genesis has been offered.

Carrollite, meneghinite and bournonite from the Kuroko deposits, Akita Prefecture, Japan