Formula: Mn8Si6O15(OH)10
Reflected/transmitted colour: yellow
Pleochroism: weak, in yellow tints
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.624, b = 1.650, g = 1.650
Birefringence δ: 0.026
2V angle: ~ 0°
Dispersion:
Optical orientation: a ┴ {001}
Optical axial plane:
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