Summary
A number of micas of varying compositions and polytypism have been selected from the literature for multiple linear regression analysis. The c dimension in micas is found to depend on the sizes of the interlayer cation, di, and tetrahedral cation, dt, as well as on the hydroxyl content, [OH]. The regression equation obtained: cr = 5.415 + 0.071[OH] + 2.098di + 2.335dt with R2 = 90.5%, shows that the three variables affect the c-axis dimension in the order dt > di ≫ [OH]. Addition of 2- and 3-layer polytypes to the regression analysis reduces R2 to 87.2%. Application of the regression analysis to synthetic Al-rich biotites from the literature shows that the amount of [A1IVA1VI]1Y[Fe2+, MgSi]−1y in solid solution is limited and always less than [A1VIO]1z[Fe2+, MgOH]−1z (i.e. 0.35 > y ≪ z). The maximum value of the vector y in solution is slightly higher than that reported for natural Al-rich biotites.
Zusammenfassung
Eine Anzahl von Glimmern unterschiedlicher Zusammensetzung und Polytypie wurde aus der Literatur für eine multiple lineare Regressionsanalyse ausgewählt. Es stellte sich heraus, dass in Glimmern die Gitterkonstante c von den Grössen des Zwischenschicht-Kations di und des tetraedrischen Kations dt abhängt, ferner vorn Hydroxylgehalt, [OH]. Die erhaltene Regressionsgleichung cr = 5,415 + 0,071 [OH] + 2,098di + 2,335dt mit R2 = 90,5% zeigt, dass die drei Variablen die Grösse der c-Achse in der Reihenfolge dt > di ≫ [OH] beeinflussen. Der Einschluss von 2- und 3-Schicht Polytypen in die Regressionsanalysen verkleinert R2 auf 87,2%. Die Anwendung der Regressionsanalysen auf synthetische Al-reiche Biotite aus der Literatur zeigt, der Betrag von [A1IVA1VI]1y[Fe2+, MgSi]−1y beschränkt und immer kleiner als [A1VIO]1z[Fe2+, MgOH]−1z (mit 0,35 < y ≪ z) ist. Der Maximalwert des Vektors y in Lösung ist etwas grösser als jener, der für natürliche Al-reiche Biotite angegeben wurde.
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Ferrow, E.A. The relation between c dimension and exchange components in micas. Mineralogy and Petrology 43, 23–35 (1990). https://doi.org/10.1007/BF01164219
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DOI: https://doi.org/10.1007/BF01164219


