Formula: K2Ca4Si7O17(O,OH,F)4
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α =1.570, β = n.d., γ = 1.577
Bireflectance/Birefringence δ: 0.007
2V angle: 38° (measured)
Dispersion: Weak, r < v
Optical orientation: Z ⋀ c = 0-15°
Optical axial plane:
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