Formula: Ag3Hg(V,As)O4
Reflected/transmitted colour:
Pleochroism: Strong, red-orange to orange-brown
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 2.3, ε = 2.5
Bireflectance/Birefringence δ: 0.2
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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