Formula: Ca2(Mg, Fe) (Mg, Fe, Al)4 Be4 (PO4)6 (OH)4.6H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.606, β = 1.610, γ = 1.620
Bireflectance/Birefringence δ: 0.014
2V angle: 66° (calculated), 72° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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