Hauyne
Rare feldspathoid mineral in the sodalite group
Hauyne
Hauyne or haüyne, also called hauynite or haüynite ( ah-WEE-nyte), old name Azure spar, is a rare tectosilicate sulfate mineral with endmember formula Na3Ca(Si3Al3)O12(SO4). 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. Hauyne was first described in 1807 from samples discovered in Vesuvian lavas in Monte Somma, Italy, and was named in 1807 by Brunn-Neergard for the French crystallographer René Just Haüy (1743–1822). It is sometimes used as a gemstone.
Read on Wikipedia · Image Robert M. Lavinsky, CC BY-SA 3.0
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