Formula: Ca4B10O19.20H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.502, β = 1.517
Bireflectance/Birefringence δ: 0.015
2V angle:
Dispersion:
Optical orientation: Inclined extinction, Z' Ù long axis = 30-33°
Optical axial plane:
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