Formula: BiFe2(SiO4)2(OH)
Reflected/transmitted colour: light green?
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign:
Refractive indices: a = 1.93, b = 1.97, g = 2.01
Birefringence δ: 0.08
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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