polybasite
/ˌpɒlɪˈbeɪsʌɪt/Mineralogy
noun
A mineral of the hexagonal crystal system that is a sulphide and antimonide of silver and copper, (Ag,Cu)16Sb2S11, and occurs as thin, tabular, black, metallic crystals.
Origin
Mid 19th century; earliest use found in Edinburgh New Philosophical Journal. From poly- + base + -ite, after German Polybasit.
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