Formula: CaZrSi6O15 . 2.5H2O
Reflected/transmitted colour: brown
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.563, b = 1.569, g = 1.573
Birefringence δ: 0.01
2V angle:
Dispersion: r < v
Optical orientation: g = b, b Ù c = 5-7°
Optical axial plane:
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