Formula: Sn21O6(OH)14Cl16
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial, anomalously biaxial in strained crystals
Optical sign: +
Refractive indices: ω = 2.060, ε = 2.110
Birefringence δ: 0.050
2V angle: small, observed on strained crystals
Dispersion:
Optical orientation:
Optical axial plane:
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