Formula: SrMn2Si2O7(OH)2 . H2O
Reflected/transmitted colour:
Pleochroism: Strong, from yellowish brown to dark red brown
Optical isotropy/anisotropy: Biaxial
Optical sign: +/-
Refractive indices: α = > 1.82
Bireflectance/Birefringence δ:
2V angle: 63° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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