Hibonite - Ca(Al,Ti,Mg)12O19 - in a CAI. It can be gorgeous.
Jeff
On 2010-02-06 12:06 PM, [email protected] 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
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