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Hauyne

Hauyne or haüyne, also called hauynite or haüynite, is a tectosilicate sulfate mineral with endmember formula Na₃CaO₁₂. 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. Wikipedia
Category: Tectosilicate, sodalite group
Color: Blue, white, gray, yellow, green, pink
Crystal class: Hextetrahedral (43m); H-M symbol (4 3m)
Crystal habit: Dodecahedral or pseudo-octahedral
Refractive index: n = 1.494 to 1.509
Specific gravity: 2.4 to 2.5
Twinning: Common on