Gem Note: Hauyne

Posted on January 7, 2015 by John Bradshaw GG (GIA)

Introduction: Haüyne is an extremey rare mineral, a member of the sodalite group, and is even more rare as a gemstone with the formula (Na,Ca)4-8Al6Si6(O,S)24(SO4,CL)1-2. It is sometimes seen in the literature as hauyne or…

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