Formula: Mg3(Si2O5)(OH)4
Reflected/transmitted colour: colourless to pale green
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.558-1.567, β = ~ 1.566, γ = 1.562-1.574
Birefringence δ: 0.004-0.007
2Vα angle: 37-61°
Dispersion: r > v
Optical orientation: α = ~ z, β = x, γ = y
Optical axial plane: ┴ (010)
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