Formula: (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 1.569, ε = 1.571
Bireflectance/Birefringence δ: 0.002
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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