Aspidolite

Aspidolite
General
CategoryPhyllosilicate minerals
GroupMica group, trioctahedral mica group
FormulaNaMg3AlSi3O10(OH)2
IMA symbolAsp
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

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

References

External image
image icon Aspidolite (Kasuga, Japan)
  1. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. 1 2 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. Bibcode:2005MinM...69.1047B. doi:10.1180/0026461056960307. S2CID 131500536.