stillwellite

== English == === Etymology === Named after Australian mineralogist Frank Leslie Stillwell (1888–1963), +‎ -ite. As a rare earth mineral ore, it usually requires a suffix of the element (i.e. Stillwellite-(Ce)). === Noun === stillwellite (uncountable) (mineralogy) A trigonal-pyramidal rare earth borosilicate mineral. === Further reading === David Barthelmy (1997–2026), “Stillwellite-(Ce)”, in Webmineral Mineralogy Database. “Stillwellite-(Ce)”, in Mindat.org, Keswick, Va.: Hudson Institute of Mineralogy, 2000–2026.