Formula: (Ca,Sr)(Nd,Ce)3(CO3)4(OH)3 . H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.654, β = 1.733, γ = 1.772 (calcio-ancylite-(Ce)), α = 1.66, β = 1.725, γ = 1.761 (calcio-ancylite-(Nd))
Bireflectance/Birefringence δ: 0.0118 (calcio-ancylite-(Ce)), 0.101 (calcio-ancylite-(Nd))
2V angle: 66° (calculated), 60-70° (measured) (calcio-ancylite-(Ce)), 70° (calculated), 70-74° (measured) (calcio-ancylite-(Nd))
Dispersion: r < v (calcio-ancylite-(Ce))
Optical orientation:
Optical axial plane:
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