Formula: Tl2(Cu,Fe)6SbS4
Reflected/transmitted colour: polished section white to light gray with brownish creamy tint
Pleochroism: notable in air
Optical isotropy/anisotropy: polished section distinct anisotropy, orange-brown tints
Optical sign:
Refractive indices:
Birefringence δ/bireflectance polished section, air noticeable, colourless or weak blue, and pinkish lavender
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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