Formula: CaCO3
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: ε =1.486-(1.550) , w = 1.658-(1.740) (higher values are calcite where Ca is substituted by other cations)
Birefringence δ: 0.172- (0.190)
2V angle:
Dispersion: very strong
Optical orientation:
Optical axial plane:
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