Formula: (Ag,Cu)2S
Reflected/transmitted colour: opaque, polished section light grayish white (RL)
Pleochroism:
Optical isotropy/anisotropy: polished section strong, gray, pale grayish blue and light tan. Less pronounced than for stromeyerite, stronger than for jalpaite
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section distinct
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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