Formula: NaCa2Si4O10F
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.567, b = 1.579, g = 1.581
Birefringence δ: 0.014
2V angle: 47°
Dispersion:
Optical orientation:
Optical axial plane:
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