Tugtupite
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Tugtupite is a beryllium aluminium tectosilicate. It also contains sodium and chlorine and has the formula Na₄AlBeSi₄O₁₂Cl. Tugtupite is a member of the silica-deficient feldspathoid mineral group. It occurs in high alkali intrusive igneous rocks.... Wikipedia
Crystal class: Disphenoidal (4); H-M symbol: (4)
Crystal system: Tetragonal
Mohs scale hardness: 4
Space group: I4
Ultraviolet fluorescence: SWUV: inert to strong red to orange red; LWUV: inert or red to orange red