[meteorite-list] blue chondrule in a CM2

From: Jeff Grossman <jgrossman_at_meteoritecentral.com>
Date: Sat, 06 Feb 2010 12:37:54 -0500
Message-ID: <4B6DA8F2.1030606_at_usgs.gov>

Hibonite - Ca(Al,Ti,Mg)12O19 - in a CAI. It can be gorgeous.

Jeff

On 2010-02-06 12:06 PM, Zelimir.Gabelica at uha.fr wrote:
>
> Hi List,
>
> Here are 3 pics of a genuine blue chondrule spotted upon breaking a
> fagment of the CM2 meteorite Tanezrouft 082 (purchased last June in
> Ensisheim, from A. Gouesslain/J.-L. Parodi, the meteorite finders).
>
> See here:
>
> http://www.agab.be/question/question.html
>
> Question: what could be the origin of such a strange turquois-like
> blue color ?
>
> Could it be due to some traces of Cu2+ salts neutralizing some
> refractory silicates ? (despite tha fact that the presence of Cu was
> apparently not reported in the meteorite analysis, see the Met. Bull.
> writeup added in the URL).
>
> Or could that just be (sometimes) the natural color of some
> (ortho)pyroxenes ?
>
> Or olivine ?
> However, I don't remember having ever seen any olivine showing such a
> "true" blue color. Shouldn't olivine (always?) rather be
> "olive-green", whatever its origin (terrestrial or asteroidal) ?
>
> Thanks for sharing your thoughts or expertise.
>
> My best,
>
> Zelimir
>
>
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-- 
Dr. Jeffrey N. Grossman       phone: (703) 648-6184
US Geological Survey          fax:   (703) 648-6383
954 National Center
Reston, VA 20192, USA

Received on Sat 06 Feb 2010 12:37:54 PM PST