Formula: (Mn,Ca)Mn4O9.H2O
Reflected/transmitted colour: RL yellowish gray
Pleochroism: RL weak, yellowish white to yellowish light gray
Optical isotropy/anisotropy: Uniaxial, RL moderate yellowish gray to light brownish gray
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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