[meteorite-list] Triple Junctions in my Bilanga Thin Section
bernd.pauli at paulinet.de
bernd.pauli at paulinet.de
Tue Jan 30 17:05:21 EST 2007
Hello All,
Triple junctions (grain boundaries meeting at [near] 120° angles) are a well-known
phenomenon in acapulcoites, several SNCs, ureilites, winonaites, in Itqiy, and a few
other meteorites. But they seem to be rather rare in diogenites. The only diogenites
I was able to locate in my databases in which such triple junctions have been reported
are the Antarctic diogenites GRA 98108 and MET 001060.
So I am very pleased to report the occurrence of a cluster/an aggregate of six (!) crystals
(five [ortho]pyroxene + one plagioclase crystal) meeting in triple junction in my Bilanga
thin section.
This cluster of first-order colors is flanked by two dazzling, purple-blue-violet-red
crystals (they almost steal the "triple junction show" ;-) which are probably olivines
although they display cleavages that look suspiciously like cleavages seen in pyroxenes!
So neat, so cute, so beautiful, so gorgeous, so exciting, ... getting emotional ;-)
Good night,
Bernd
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