Abstract
Experimental frequencies of growth spirals as a function of the dislocation strength are reported for synthetic phlogopite 1M and 1Mrn(120) as well as for muscovite, paragonite and Mg-Al phengite with 1M and 2M1 as basic structures. There is a much greater propensity of the spirals to grow further ordered basic structures than to create new polytypes based on them. Also extended to 2M2 and 3T basic structures, a semi-quantitative model is proposed which accounts fairly well for the shapes of the frequency histograms. It is based on the assumption that the elastic energy, as well as the energy of the lattice mismatch across the cut plane, of the dislocations control those frequencies. Crystal-chemical considerations on this lattice mismatch allows one to understand why complex polytypes appear in some natural trioctahedral micas while they are absent in natural dioctahedral micas.
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