ˈgen(t)thəlˌvīt, (ˈ)gent|helˌ-, genˈthelˌ- noun
( -s )
Etymology: Frederick A. Genth died 1893 American mineralogist born in Germany + English helvite
: a mineral (Zn,Fe,Mn) 8 Be 6 Si 6 O 24 S 2 consisting of a silicate and sulfide of zinc and beryllium and usually containing also iron and manganese isomorphous with danalite and helvite