Formula: Na0.5(Al,Mg)6(Si,Al)8O18(OH)12.5H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.564, β = 1.570, γ = 1.574
Bireflectance/Birefringence δ: 0.010
2V angle: 59° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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