Formula: CaMg(AsO4)(OH)
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.712, β = 1.721, γ = 1.731
Birefringence δ: 0.019
2V angle: 68 to ~90°
Dispersion: r < v, weak
Optical orientation: α = a, β = c, γ = b
Optical axial plane:
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