Formula: BaCa2Al6Si9O30.2H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial with uniaxial domains
Optical sign: -
Refractive indices: a = 1.550-1.551, b = 1.557-1.559, g = 1.559-11.562
Birefringence δ: 0.01
2V angle: 58-65°
Dispersion:
Optical orientation: a = c, g = b
Optical axial plane:
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