Formula: KHCO3
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.380, β = 1.482, γ = 1.578
Bireflectance/Birefringence δ: 0.198
2V angle: 82° (calculated), 81.5° (measured)
Dispersion:
Optical orientation: Y = b, X Ù c = 30°
Optical axial plane:
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