Formula: Ca6Si6O17(OH)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.583, β = 1.585, γ = 1.595
Bireflectance/Birefringence δ: 0.012
2V angle: calculated: 50°
Dispersion:
Optical orientation:
Optical axial plane:
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