Formula: Ca3(SiO3OH)2.2H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: a = 1.616-1.618, b = 1.619-1.621, g = 1.631-.634
Birefringence δ:
2V angle: 50-56°
Dispersion: r < v
Optical orientation: g = b, a Ù c = 31.2°
Optical axial plane:
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