Formula: Cu2Mg2(Mg,Cu)(AsO4)2(OH)4·4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.664, β = 1.691, γ = 1.695
Bireflectance/Birefringence δ: 0.031
2V angle: 31° (calculated), 42° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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