Formula: Ca2(Fe,Mn)ScSi5O14OH
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.686, β = 1.694, γ = 1.709
Bireflectance/Birefringence δ: 0.023
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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