Formula: (Pb,Ca)2-3(CO3)1.5-2(OH, F)0.5-1[(Fe,Al)2Si4O10(OH)2] . nH2O
Reflected/transmitted colour:
Pleochroism: Yellow (x), brown (y), light green (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.757, β = 1.763, γ = 1.773
Bireflectance/Birefringence δ: 0.016
2V angle: 76° (calculated), 76° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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