Formula: Mg3(Si2O5)(OH)4
Reflected/transmitted colour: colourless to pale green
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.532-1.549, β -, γ = 1.545-1.556
Birefringence δ: 0.013-0.017
2Vα angle: -
Dispersion: -
Optical orientation: γ = x
Optical axial plane: -
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