Formula: Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2.4H2O
Reflected/transmitted colour: Emerald green
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.551-1.56, β = 1.564, γ = 1.569
Bireflectance/Birefringence δ: 0.009-0.018
2V angle: small (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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