Citation: Brigatti, M. F.; Frigieri, P.; Poppi, L. (1998). Crystal chemistry of Mg-, Fe-bearing muscovites-2M1 Sample A4b from peraluminous granites at Sardinia, Italy. American Mineralogist, 83, pp. 775-785.
Formula: Al2.96 F0.02 Fe0.08 K0.92 Mg0.06 Na0.08 O11.98 Si2.92 Ti0.02
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al14 F4 Fe4 Mg4 O24 Si8 Ti4 (Al7 F2 Fe2 Mg2 O12 Si4 Ti2)
Multiplicity: 1