Formula: Ca3(Be,Al)2Si3O10(OH)2
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: w = 1.647, e = 1.637
Birefringence δ: 0.01
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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