Formula: (NH4)HCO3
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.4227, β = 1.5358, γ = 1.5545
Bireflectance/Birefringence δ: 0.1318
2V angle: 41° (calculated), 42° (measured)
Dispersion: Weak, r < v
Optical orientation: X = a, Y = b, Z = c
Optical axial plane:
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