One of the mysteries of the English language finally explained.
A mineral of the cubic system that is a sulphide of nickel, Ni₃S₄, occurs as grey, metallic masses of polysynthetic twin crystals, and is an endmember of a series with linnaeite.
Late 19th century. From poly- + ancient Greek -δυμ- + -ite, after German Polydymit.
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