CuSe prepared by dry fusion and by hydrosynthesis is physically and structurally identical with klockmannite from Sierra de Umango, Argentina. Pyrosynthetic CuSe gave G=5.99. Minute greenish black hexagonal plates of hydrosynthetic CuSe show c(OOO1), n(001¯2), r(001¯1), m(001¯0); the unit cell with space group C6/mmc, a=3.93, c = 17.22 kX, contains 6[CuSe]. A superstructure has a' = 12a, c'=c. Klockmannite is clearly isostructural with covellite.

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