Formula: (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72 . 30H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: w = 1.522, e = 1.507
Birefringence δ: 0.015
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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