A selenian polybasite from La Guadalupe Arcos mines, Zacualpan, Mexico, has the cell dimensions a=13.00, b=7.50, c=11.99A, beta =90 degrees and the composition (Ag (sub 25.8) Cu (sub 6.2) )(Sb (sub 2.6) As (sub 1.4) )(S (sub 17.0) Se (sub 5.0) ). The classification of the polybasite-pearceite minerals is discussed. The use of the name polybasite when Sb>As and pearceite when As>Sb is preferred.

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