Formula: (Ba,Sr)2TiMn2(SiO4)2(PO4,SO4)(OH,Cl)
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.763, β = 1.777, γ = 1.785
Bireflectance/Birefringence δ: 0.022
2V angle: 72° (calculated), 85-90° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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