[meteorite-list] What is or is not a chondrule?

From: MEM <mstreman53_at_meteoritecentral.com>
Date: Tue, 24 Nov 2009 22:37:23 -0800 (PST)
Message-ID: <605236.65032.qm_at_web55202.mail.re4.yahoo.com>

Hello Tom, excellent photo!
I believe this is one of those "heated-cooled-heated-quenched" cycled chondrules and the "crosses" are the seed/loci of crystallization: the "de-vitrification" of the glass matrix into ordered alignment of the molecules( aka crystallized solid). In other words, this is a frozen example one phase of the chondrule forming process. It is a body that lies between glass/dust and crystallized.

Were we able to watch this process in time lapse we would see the crosses grow in length and width until all the matrix was converted.

Elton


> Tom Philips wrote:
>
> >... I wonder if this weird crystal structure
> found? in a slice of JaH 055 would
> > qualify for being called a chondrule or a small?
> inclusion...

> > http://www.meteorite.com/meteorite-gallery/meteorite-pages/JaH-055-Crystal.htm
>
> ???
> ????????
> ?????? ???
> ?
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Received on Wed 25 Nov 2009 01:37:23 AM PST