sekaninaite


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sekaninaite

[sə′kän·ən·ə‚īt]
(mineralogy)
A violet variety of cordierite in which magnesium is largely replaced by ferrous iron. Also known as iron cordierite.
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Most minerals of these rock sare rich in magnesium, and--as well as in global scale specimens containing more than 50 % Fe/(Fe+Mg) (= sekaninaite) are relatively rare.
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).
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.
The timing of this process was connected with the decompression of granulites but it is definitely older than the blastic growth of sekaninaite. The reversal succession of both minerals, as claimed by Behr (1961) for Saxonian granulites, must be refused.
This ranges this mineral to sekaninaite within the cordierite-series.
and McCammon, C.A.: 1997, Lithium sekaninaite from the type locality, Dolni Bory, Czech Republic, Canad.
and Miskovsky, J.: 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.