Formula: BaCa(CO3)2
Reflected/transmitted colour: colourless, showing six or twelve domains
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.526, β = 1.671, γ = 1.672
Birefringence δ: 0.146
2V angle: measured: 6° , calculated: 8°
Dispersion: r > v, weak
Optical orientation: α = c, β = a, γ = b
Optical axial plane:
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