Formula: KAl2(PO4)2(OH).2H2O
Reflected/transmitted colour:
Pleochroism: Strong, pale orange (X), light purple (Y), dark purple red (Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.591, β = 1.597, γ = 1.604
Bireflectance/Birefringence δ: 0.013
2V angle: 86° (calculated), 86° (measured)
Dispersion:
Optical orientation: X = b
Optical axial plane:
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