Formula: Hg2OCl
Reflected/transmitted colour: Pale olive-green
Pleochroism: Slight, green to yellow
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 2.35, β = 2.64, γ = 2.66
Bireflectance/Birefringence δ: 0.31
2V angle: 26° (calculated), 20° (measured)
Dispersion: Extreme, r < v
Optical orientation:
Optical axial plane: OAP || b and inclined -7° to c
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