Formula: (K,Ca)Ca4(Si8O20)(F,OH).8H2O
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: uniaxial
Optical sign: +
Refractive indices: w = 1.534-1.542, ε = 1.535-1.543
Birefringence δ: ~ 0.002
2V angle:
Dispersion: high, sometimes anomalous
Optical orientation:
Optical axial plane:
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