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5 sekaninaite - - - - Muscovite-biotite Biotite Gneiss Gneiss (depth 8411 m) (depth 7913 m) Minerals Surface Surface Core Surface Surface analogue analogue sample analogue analogue 2-02 PL-366 28938 4-02 PL-367 hornblende 2 4 ac (1) ac (1) ac (1) epidote ac (1) 1.
Sekaninaite as a new mineral of the cordierite series approved by IMA was discovered in pegmatite from Dolni Bory in Moravia by Stanek and Miskovsky (1975) and later studied by Cerny et al.
However, they designated it--according to the practice of that time--with the collective name cordierite because sekaninaite was introduced four years later as the IMA-approved specific mineral species (Stanek and Miskovsky 1975).
The latter represent the most ferrous sekaninaite hitherto known from metamorphic rocks of the Bohemian Massif (sekaninaites from pegmatites are of course richer in Fe).
Sekaninaite grains are almost isometric in form and always xenoblastic in outline.
The cancer-like metastatic growth of sekaninaite poikiloblasts already mentioned in the Zd'arske Chalupy granulite is well developed in the Bernkopf granulite, too (Fig.
These two minerals, hercynite and sekaninaite, never occur together: as soon as sekaninaite appears in the rock, hercynite disappears (is consumed).
This ranges this mineral to sekaninaite within the cordierite-series.
1997, Lithium sekaninaite from the type locality, Dolni Bory, Czech Republic, Canad.
1975, Sekaninaite, a new mineral of the cordierite series, from Dolni Bory, Czechoslovakia, Scripta prir.
Associated minerals are: alkali-feldspar, plagioclase, quartz, sekaninaite, andalusite, topaz, garnet, biotite, muscovite, dumortierite, schorl, zircon, apatite, monazite, ilmenite, pyrite, cordierite, sericite and chlorite.