Formula: Mg3(Si2O5)(OH)4
Reflected/transmitted colour: colourless to pale green
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.538-1.554, β - , γ = 1.546-1.560
Birefringence δ: -.006-0.008
2Vα angle: -
Dispersion: -
Optical orientation: α = z
Optical axial plane:
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