Formula: Mn4Mg(AsO4)2(OH)4.4H2O
Reflected/transmitted colour: colourless to faint pink
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.672, β = 1.676, γ = 1.683
Birefringence δ: 0.011
2V angle: medium
Dispersion: r < v, moderately strong
Optical orientation: α = b, γ ^ c = ~45°
Optical axial plane:
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