polybasite

From poly- +‎ base (as in "base metal") +‎ -ite.

polybasite (countable and uncountable, plural polybasites)

1. (mineralogy) A black ore consisting of silver, sulfur, and antimony, with some copper and arsenic.

• David Barthelmy (1997–2025) “Polybasite”, in Webmineral Mineralogy Database.
• “polybasite”, in Mindat.org‎^[1], Hudson Institute of Mineralogy, 2000–2025.
• “polybasite”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.