Formula: Ca6Mg2(SO4)2(CO3)2Cl4(OH)4.7H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.567, β = 1.654, γ = 1.722
Bireflectance/Birefringence δ: 0.155
2V angle: 78° (calculated), 83° (measured)
Dispersion:
Optical orientation: Positive elongation, parallel extinction
Optical axial plane:
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