Formula: Pb4Cu4HSi4O12(HCO3)4(OH)4Cl
Reflected/transmitted colour: bluish
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign: +
Refractive indices: w = 1.786, e = 1.800
Birefringence δ: 0.014
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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