Formula: MgBO2(OH)
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.53-1.67, β = 1.53-1.73, γ = 1.55-1.74
Bireflectance/Birefringence δ: 0.02-0.07
2V angle: 0-42° (calculated), 0-10° (measured)
Dispersion: None
Optical orientation:
Optical axial plane:
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