Formula: CaHAsO4
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.644, β = 1.670, γ = 1.688
Bireflectance/Birefringence δ: 0.044
2V angle: 78 (calculated), 82 (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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