Formula: Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x= 0.5)
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.546, β = 1.572, γ = 1.576
Bireflectance/Birefringence δ: 0.030
2V angle: 42°
Dispersion:
Optical orientation:
Optical axial plane:
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