Formula: MgB6O7(OH)6.2H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.472, β = 1.503, γ = 1.526
Birefringence δ: 0.054
2V angle: measured: 88°, calculated: 78°
Dispersion:
Optical orientation: α = a, β = c, γ = b
Optical axial plane:
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