Formula: Cu5Zn5(As,Sb)2P8(OH)14
Reflected/transmitted colour: Pale blue-green
Pleochroism:
Optical isotropy/anisotropy: Biaxial, nearly uniaxial
Optical sign: -
Refractive indices: a=1.755, b=1.785, g=1.785
Bireflectance/Birefringence δ: 0.030
2V angle: ~ 0°
Dispersion:
Optical orientation:
Optical axial plane:
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