Formula: MnCO3
Reflected/transmitted colour: colourless or pale pink
Pleochroism: red varieties may show pleochroism with absorption w > ε
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: ε =(1.540)- 1.597-(1.617) , w = (1.750)-1.816-(1.850) (other values are for rhodochrosite where Mn is substituted by other cations)
Birefringence δ: (0.19)-0.219-(0.23)
2V angle:
Dispersion: strong
Optical orientation:
Optical axial plane:
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