Formula: Ca0.2Mg6(Si, Al)8O20(OH)4.4H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign:
Refractive indices: n = 1.558-1.567
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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