ˈhyülənˌdīt noun
( -s )
Etymology: Henry Heuland 19th century English mineral collector + English -ite
: a zeolite (Na,Ca) 4-6 Al 6 (Al,Si) 4 Si 26 O 72 .24H 2 O consisting of a hydrous aluminosilicate of sodium and calcium often occurring as foliated masses with pearly luster on the cleavage surfaces