Formula: []4Zn4Al16(Al2[]2)Si8O40[(OH2)O6]
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.722, γ = 1.734
Bireflectance/Birefringence δ: 0.012
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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