[meteorite-list] Triple Junctions in my Bilanga Thin Section

From: bernd.pauli at paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: 30 Jan 2007 22:05:21 UT
Message-ID: <DIIE.000000BC0000155A_at_paulinet.de>

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
Received on Tue 30 Jan 2007 05:05:21 PM PST