Formula: Cu9Si10O29.11H2O
Reflected/transmitted colour: rich blue
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.610, b = 1.650, g = 1.650
Birefringence δ: 0.04
2V angle: small
Dispersion:
Optical orientation: b ≈ length
Optical axial plane:
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