Formula: SrAlF4(OH).H20
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.451, β = 1.453, γ = 1.462 - 1.463
Birefringence δ: 0.012
2V angle: measured: 46° to 57°, calculated: 50° to 52°
Dispersion: r > v, strong
Optical orientation: α = b, γ^c = 15°
Optical axial plane:
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