The 2:1 mica layer is composed of two opposing tetrahedral (T) sheets with an octahedral (M) sheet between to form a “TMT” layer (Fig. 1a1). The mica structure has a general formula of A M2–3 T4 O10 X2 [in natural micas: A = interlayer cations, usually K, Na, Ca, Ba, and rarely Rb, Cs, NH4, H3O, and Sr; M = octahedral cations, generally Mg, Fe2+, Al, and Fe3+, but other cations such as Li, Ti, V, Cr, Mn, Co, Ni, Cu, and Zn can occur also...
Mica Crystal Chemistry and the Influence of Pressure, Temperature, and Solid Solution on Atomistic Models
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Maria Franca Brigatti, Stephen Guggenheim; Mica Crystal Chemistry and the Influence of Pressure, Temperature, and Solid Solution on Atomistic Models. Reviews in Mineralogy and Geochemistry 2002;; 46 (1): 1–97. doi: https://doi.org/10.2138/rmg.2002.46.01
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