Trichmirgems

Hauyne or haüyne, also called hauynite or haüynite (/ɑːˈwiːnaɪt/ ah-WEE-nyte),[7] old name Azure spar,[8]: 571 is a rare tectosilicate sulfate mineral with endmember formula Na3Ca(Si3Al3)O12(SO4).[1] As much as 5 wt % K2O may be present, and also H2O and Cl. It is a feldspathoid and a member of the sodalite group.[4][5] Hauyne was first described in 1807 from samples discovered in Vesuvian lavas in Monte Somma, Italy,[9] and was named in 1807 by Brunn-Neergard for the French crystallographer René Just Haüy (1743–1822).[4] It is sometimes used as a gemstone.[10]

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