willemseite

== English == === Etymology === This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term. ? + -ite === Noun === willemseite (mineralogy) A monoclinic-prismatic light green mineral containing hydrogen, magnesium, nickel, oxygen, and silicon. ==== References ==== David Barthelmy (1997–2026), “Willemseite”, in Webmineral Mineralogy Database.