Formula: KCa7(Ti,Zr)2Li3Si12O36F2
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: a = 1.670, b = 1.670-1.671, g = 1.673-1.677
Birefringence δ: 0.007
2V angle: 32-60°
Dispersion: r > v, strong
Optical orientation: a Ù┴ {001} ≈ 50°
Optical axial plane:
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