Berndtite

Formula: SnS2

Reflected/transmitted colour: polished section gray with intense brownish to orange-yellow internal reflections

Pleochroism: strong

Optical isotropy/anisotropy: dark greenish gray

Optical sign:

Refractive indices:

Birefringence δ:

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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