Formula: Ca2NaH(SiO3)3
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1. 595-1.610, β = 1.605-1.615, γ 1.632-1.645
Birefringence δ: 0.030-0.038
2Vγ angle: 50-63°
Dispersion: r > v, weak
Optical orientation: α Λ z = 10-19°, β Λ x = 10-16°
Optical axial plane: near (100)
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