Formula: Zn3Si4O10(OH)2.4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.514, β = 1.559, γ = 1.562
Bireflectance/Birefringence δ: 0.048
2V angle: 28° (calculated), 0-22° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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