Hallo Helmut,
klasse, danke.
Dort ist nur die Zuordnung zur Untergruppe 7.DD. genannt. Interessanterweise steht aber dort:
Among all the possible layered structures listed in Eby & Hawthorne (1993), montetrisaite is structurally related to posnjakite (Mellini & Merlino 1979), wroewolfeite (Hawthorne & Groat 1985) and langite (Gentsch & Weber 1984), which have all n = 4, N = 1, and spangolite (Merlino et al. 1992, Hawthorne et al. 1993; n = 7, N = 1). All these phases, in fact, show sulfate groups connected only to one side of the layers of octahedra. On the contrary, the crystal structure of the mineral redgillite, despite the similarity of its chemical formula to that of montetri- saite, is substantially different. The sulfate decoration of the layer surfaces in redgillite, in fact, is two-sided, as in schulenbergite (Mumme et al. 1994), and the layers of octahedra are corrugated, as observed in the synthetic compound Mg6SO2(OH)14 (Hamada et al. 1996).
Was eine Zuordnung nach 7.DD.10 wie in Wiki beschrieben wohl rechtfertigt. Was meint ihr? Und was ist die Untergruppe 7.DD.85 in Mindat?
Grüße Markus