bertrandite

== English == === Etymology === From Bertrand +‎ -ite, named after French mineralogist Émile Bertrand (1844-1909) in 1883. === Noun === bertrandite (countable and uncountable, plural bertrandites) (mineralogy) A basic beryllium sorosilicate that is an ore of beryllium. === References === === Further reading === David Barthelmy (1997–2026), “Bertrandite”, in Webmineral Mineralogy Database. “bertrandite”, in Mindat.org‎[1], Hudson Institute of Mineralogy, 2000–2026. == French == === Noun === bertrandite f (plural bertrandites) (mineralogy) bertrandite