Formula: K2ZrSi6O15
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.575, β = 1.59, γ = 1.601
Bireflectance/Birefringence δ: 0.026
2V angle: 80° (calculated), 72° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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