Examination of polished specimens of ores from the Comstock Lode has revealed the presence, hitherto unsuspected, of the silver sulpho-selenide, aguilarite. Aguilarite was not recorded by E. S. Bastin1 in the only previous paper on the ores of the Comstock Lode. It occurs in dark gray, sectile masses, intimately admixed with other minerals, and exhibiting a poor cleavage, visible only in hand specimens. It replaces base metal sulphides and calcite, and is replaced by argentite, electrum, and stephanite.

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