Formula: Mn5(SiO4)2(OH)2
Reflected/transmitted colour: pink or buff in thick sections
Pleochroism: varieties of pink in thicker sections
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.756, b = 1.780, g = 1.792
Birefringence δ: 0.036
2V angle: 72°
Dispersion: r > v
Optical orientation:
Optical axial plane: g = b
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