Formula: (Sr,Ba,Ca)Al2Si6O16 . 5H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: a = 1.510, b = 1.512, g = 1.523
Birefringence δ: 0.013
2V angle: 65°
Dispersion: g ┴ (010), a Ù c = 19-34° in various sectors of the crystal
Optical orientation:
Optical axial plane:
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