Formula: Cu3V2O7(OH)2.2H2O
Reflected/transmitted colour: Green to yellowish green
Pleochroism: Faint
Optical isotropy/anisotropy: Biaxial
Optical sign: - or +
Refractive indices: α = 1.820–2.01, β = 1.835–2.05, γ = 1.92–2.07
Bireflectance/Birefringence δ: 0.06-0.25
2V angle: 63-83° (measured)
Dispersion: Inclined, r < v, r > v
Optical orientation:
Optical axial plane:
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