[meteorite-list] Some help with [Brenham] inclusions

From: jbaxter112 at pol.net <jbaxter112_at_meteoritecentral.com>
Date: Wed, 22 Aug 2007 11:03:09 -0400 (EDT)
Message-ID: <62703.10.250.10.1.1187794989.squirrel_at_webmail.medscape.com>

Hello Martin and Berndt,

Here's an old article(thanks to Google)which implies that the original
article naming these lamellae, by Brezina in 1882, referred to thin
troilite plates oriented parallel to the cube planes of iron. They were
first described by Reichenbach in 1861. This article also implies that the
term has been subsequently used very loosely so that the original
definition has been blurred somewhat:

ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19670010172_1967010172.pdf

Best Wishes,
Jim Baxter

> Hi all,
>
> I haven't a picture at hand,
> but as far as I know, the Reichenbach lamellae appear inside of the
> troilite inclusions.
> I had once a Mundrabilla with a typical troilite eye, which displayed
> those lamellae.
> The troilite looked barred or intersected by parallel lines. The bars
> were a little less than 1mm wide.
>
> Or to express it else: A striped troilite drop.
>
> Best!
> Martin
>
> -----Urspr?ngliche Nachricht-----
> Von: meteorite-list-bounces at meteoritecentral.com
> [mailto:meteorite-list-bounces at meteoritecentral.com] Im Auftrag von
> bernd.pauli at paulinet.de
> Gesendet: Mittwoch, 22. August 2007 16:30
> An: meteorite-list at meteoritecentral.com
> Betreff: Re: [meteorite-list] Some help with [Brenham] inclusions
>
> Hello Mike M., Herman and List,
>
> Herman kindly wrote: "I believe the long schreibersite inclusions
> are called 'richenbach lamellae', please correct me if I am wrong."
>
> I don't think we are looking at so-called "Reichenbach Lamellae"
> (= chromite laths surrounded by troilite / chromite = FeCr2O4).
> Wouldn't Reichenbach Lamellae be much thinner and (almost)
> straight, ... needle-like?
>
> But maybe it's Reichenbach Lamellae and schreibersite simultaneously.
> This has been observed in the Sychevka IIIAB iron, where troilite is
> intergrown with schreibersite and chromite within the Reichenbach
> lamellae of that iron.
>
> Best regards,
>
> Bernd
>
>
>
>
> To: Metorman46 at aol.com
> meteorite-list at meteoritecentral.com
>
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Received on Wed 22 Aug 2007 11:03:09 AM PDT