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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.