Formula: MgSiO2(OH)2·H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.521, β =1.525, γ = 1.545
Bireflectance/Birefringence δ: 0.024
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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