One of the mysteries of the English language finally explained.
A mineral consisting of a sulphide of silver and bismuth, AgBiS₂, that is a paramorph of matildite.
Late 19th century; earliest use found in The Century Dictionary. From German Plenargyrit, apparently from classical Latin plēnus full + ancient Greek ἄργυρος silver + German -it, after Miargyrit.
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