Formula: Sr2B11O16(OH)5.H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.549, β = 1.551, γ = 1.621
Bireflectance/Birefringence δ: 0.072
2V angle: 20° (calculated), 25° (measured)
Dispersion: Strong, r < v
Optical orientation: X = c, Z = b
Optical axial plane:
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