Tachyhydrite

Formula: CaMg2Cl6.12H2O

Reflected/transmitted colour:

Pleochroism:

Optical isotropy/anisotropy: Uniaxial

Optical sign: -

Refractive indices: ε = 1.512, ω = 1.520

Bireflectance/Birefringence δ: 0.008

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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