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(mineralogy) A tetragonal-ditetragonal dipyramidal mineral containing aluminum, fluorine, and sodium.

Chiolite – Minerals – Na₅Al₃F₁₄ – Cio – 03.CE.05 – 11.06.11.01 – Tetragonal – Ditetragonal Dipyramidal - 4/mmm (4/m 2/m 2/m) – P4/mnc – 511.06 ų – 461.8711070 – Nearly colorless, snow white – On {011} – Perfect on {001} – Distinct on {011} – 2.5 – Vitreous, pearly, greasy – White – Transparent, translucent – 2.998 – Measured: 2.998 – Calculated: 2.989 – Uniaxial (-) – Nω = 1.349 – Nε = 1.342 – 0.007.