Formula: H6(Ca,Pb)2(Cu,Zn)3(SO4)(TeO3)4(TeO6)
Reflected/transmitted colour:
Pleochroism: Moderate, in shades of bottle-green
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.815-1.915, β = 1.960-2.115, γ = 1.960-2.115
Bireflectance/Birefringence δ: 0.145-0.200
2V angle: Small (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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