Formula: Mg5(BO3)(Cl,OH)2(OH)5.4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.543, β = 1.571, γ = 1.577
Bireflectance/Birefringence δ: 0.034
2V angle: 48° (calculated), 49° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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