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(mineralogy) A rare toxic halide mineral composed of sodium fluoride.
Carmine-red, lavender-pink to light orange – Cubic crystals rare, commonly granular, massive – {001}, perfect – Brittle – 2 – 2.5 – Vitreous – White – Transparent – 2.79 – Isotropic; weak anomalous anisotropism, then uniaxial (–) – N = 1.327–1.328 – Strong E = yellow; O = pink to deep carmine – Dark red to orange and yellow fluorescence under SW and LW UV – Soluble in water.