Alamosite

Formula: PbSiO3

Reflected/transmitted colour: colourless to white

Pleochroism:

Optical isotropy/anisotropy: biaxial

Optical sign: -

Refractive indices: a = 1.945-1.947, b = 1.955-1.961, g = 1.959-1.968

Birefringence δ: 0.012-0.023

2V angle: 65°

Dispersion: r < v, strong, weak inclined

Optical orientation: b = b

Optical axial plane:

 

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