Formula: (Ca,Na)0.5(Cu,Fe,Mg)2Si4O10(OH)2.3H2O
Reflected/transmitted colour:
Pleochroism: Shades of blue green
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.53-1.545, γ = 1.56-1.575
Bireflectance/Birefringence δ: 0.030
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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