Seligmannite, a mineral first described and named by Baumhauer1 and later analyzed by Prior2 and more fully characterized by Solly3 is the arsenical equivalent of bournonite, CU2S·2PbS·AS2S3. Hitherto it has been known only from the original locality of the Binnenthal where it has been found in but few examples. The interesting discovery that this rare mineral occurs at Bingham is due to Mr. Lazard Cahn, who identified the mineral and placed the sole specimen in the Holden Collection of Harvard College, giving to the writer the privilege of describing it.

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