heulandite

== English == === Etymology === From Heuland +‎ -ite after British mineral collector John Henry Heuland (1778-1856). === Noun === heulandite (countable and uncountable, plural heulandites) (mineralogy) A common mineral of the zeolite group with monoclinic crystals, the most usual form being heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O. ==== Derived terms ==== === References === === Further reading === David Barthelmy (1997–2026), “Heulandite”, in Webmineral Mineralogy Database. “heulandite”, in Mindat.org‎[1], Hudson Institute of Mineralogy, 2000–2026.