General
Formula: (Na,Ca,▯)8(Al6Si6)O24(CO3,SO4)2 · 2H2O
Crystal system: Hexagonal
Distinguishing features
N // (PPL)
Color: colourless
Pleochrosim: –
Relief: low
Cleavage: –
N + (XPL)
Isotropy/Anisotropy: anisotropic
Interference color: I-II
Extinction angle: parallel / 0° / straight
Twins: –
Uniaxial/biaxial: Uniaxial (-)
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