Fig. 6

Compositional relations of dioctahedral white micas. Cation numbers and ratios calculated from AEM analyses. For explanations see the text. In c–e compositional parameters suggested by Guidotti and Sassi (1998) are used. t.i.c. = total interlayer charge = K + Na + 2Ca per formula unit. Small arrows with fine dotted lines indicate the effects of possible contaminations with other minerals, while dashed lines show the isomorphic substitutions within the mica structure. Ms* and Pg* indicate finely intergrown Ms and Pg phases or K–Na mixed white micas (MWM) with K or Na dominancy in the interlayer space