Formula: Pb2(Fe,Mn)Te(AlSi3)O12(OH)2 . H2O
Reflected/transmitted colour: pale magenta to carmine
Pleochroism: α = pale magenta, β = γ = carmine
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.82, β = 1.85, γ = 1.85
Bireflectance/Birefringence δ: 0.03
2V angle: small
Dispersion:
Optical orientation:
Optical axial plane:
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