It appears in the form of imperfect, large crystals and in coarsely granular or compact aggregates of a violet of grey-blue colour, which tend to turn green or yellow through the effects of weathering. Like cordierite, sekaninaite too alters into different types of mica, chiefly into muscovite. Some forms used to be described misleadingly as pinite (after the deposit of cordierite pseudomorphs from the Pini[?] mine near Schneeberg[?] in Germany) or as gigantolite (because it forms pseudomorphs after the gigantic crystals of cordierite). Similar pseudomorphs occur in several localities in Czechia, particularly near Jihlava and by Dylen[?] in the Bohemian Forest. But they are altered to such a degree that it is impossible to determine whether sekaninaite or cordierite was the original material.
Pegmatite in contact with gneisses of sedimentary origin (paragneisses) are the parent rock of sekaninaite. Sekaninaite has also recently been discovered in Japan.
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