Aspidolite

Aspidolite
General
CategoryPhyllosilicate
Formula
(repeating unit)
NaMg3AlSi3O10(OH)2
Crystal systemMonoclinic
Crystal class2/m
Space groupC2/m
Unit cella = 5.291(8), b = 9.16(2), c = 10.12(2) Å
Identification
FractureMicaceous
Optical propertiesBiaxial (-)
References[1]

Aspidolite is a mica group phyllosilicate mineral which is the sodium analogue of the magnesium-rich mineral phlogopite. The ideal chemical formula for aspidolite is NaMg3AlSi3O10(OH)2.[1]

References

  1. ^ a b Banno, Y.; Miyawaki, R.; Kogure, T.; Matsubara, S.; Kamiya, T.; Yamada, S. (2005). "Aspidolite, the Na analogue of phlogopite, from Kasuga-mura, Gifu Prefecture, central Japan: description and structural data" (PDF). Mineralogical Magazine. 69 (6): 1047–1057. doi:10.1180/0026461056960307.

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