fougerite

== English == === Alternative forms === fougèrite === Etymology === From Fougères +‎ -ite, after a commune in France where it was found. === Noun === fougerite (uncountable) (mineralogy) A trigonal clay mineral that is chemically and structurally related to green rust. === Further reading === David Barthelmy (1997–2026), “Fougerite”, in Webmineral Mineralogy Database. “fougerite”, in Mindat.org‎[1], Hudson Institute of Mineralogy, 2000–2026.