The Collaborative International Dictionary
Hauynite
Hauynite \Ha"["u]y*nite\ ([aum]"w[-e]*n[imac]t), n. [From the French mineralogist Ha["u]y.] (Min.) A blue isometric mineral, characteristic of some volcanic rocks. It is a silicate of alumina, lime, and soda, with sulphate of lime.
Wiktionary
hauynite
n. (context mineral English) An isometric tectosilicate feldspathoid mineral with sulfate and chloride.