Formula: Ca0.3(Fe2+,Mg,Fe3+)3(Si,Al)4O10(OH)2·4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.448, β = 1.641, γ = 1.642
Bireflectance/Birefringence δ: 0.194
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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