Formula: FeCO3
Reflected/transmitted colour: colourless to yellowish brown
Pleochroism: -
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: ε =(1.575)- 1.635, w = (1.782)-1.875 (lower values are for siderite where Fe is substituted by other cations)
Birefringence δ: (0.207)-0.242
2V angle:
Dispersion: strong
Optical orientation:
Optical axial plane:
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