Formula: (Ru,Os)As2
Reflected/transmitted colour: opaque, polished section white with a pink tint
Pleochroism: noticeable in air, from pinkish grayish white to pinkish white, distinct in oil
Optical isotropy/anisotropy: marked in air from brownish yellow to grayish green, pale red to pale green, pronounced in oil, from reddish yellow, greenish yellow to purplish gray
Optical sign:
Refractive indices:
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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