[meteorite-list] Re-2: Rocks from Space Picture of the Day -January 06, 2008

[Christian Anger]

Hi,

see a pic of the mainmass at 

http://epswww.unm.edu/meteoritemuseum/hand-samples.htm

Cheers,

Christian



I.M.C.A. #2673 at www.imca.cc
website: www.austromet.com
 
Ing. Christian Anger
Korngasse 6
2405 Bad Deutsch-Altenburg
AUSTRIA
 
email: christian.anger at aon.at
email: meteorites at austromet.com
> -----Original Message-----
> From: meteorite-list-bounces at meteoritecentral.com [mailto:meteorite-list-
> bounces at meteoritecentral.com] On Behalf Of bernd.pauli at paulinet.de
> Sent: Sunday, January 06, 2008 6:31 PM
> To: meteorite-list at meteoritecentral.com
> Subject: [meteorite-list] Re-2: Rocks from Space Picture of the Day -January 06, 2008
> 
> 
> http://www.rocksfromspace.org/January_6_2008.html
> 
> Jerry writes:
> 
> "What a unique specimen. I understand that there is a lack of
> metal and that the chemical composition is primarily MgSiO."
> 
> Yep, it is almost pure MgSiO3 and, because of its lack of iron, the fusion crust
> is a light brown (near-white) or almost clear glassy (translucent) color.
> 
> Jerry asks: "Does this make it crustal material?"
> 
> According to the late Robert Hutchison: "The fragmental nature of most aubrites
> and the presence of trapped solar wind in some sugggests that they are near-surface
> breccias."
> 
> Harry McSween: "Some aubrite breccias contain fragments of slowly cooled plutonic
> rocks as well as melted clasts that formed by impacts and cooled rapidly near the
> surface."
> 
> Moni inquires: "Is it slightly magnetic?"
> 
> Even though most aubrites [exceptions: Mount Egerton with 21% FeNi metal(!) and Shallowater
> with 9% metal] are really metal-poor, they do contain small amounts of nickel-iron so my guess
> is that it depends on the sensitivity of the magnet used but the attraction should be extremely
> weak - almost zero.
> 
> Moni: "a piece of stone looking like this I am not sure I would pick it up."
> 
> That's exactly what I thought when I got my specimen from Walter Zeitschel.
> I said to myself: "What's that? He must be kidding...that isn't a meteorite!"
> 
> Moni: "And is the crust grey?"
> 
> NORTON O.R. (1998) Rocks From Space II, p. 204: "A fresh specimen has a gray-
> white or light tan crust, a distinguishing characteristic of enstatite achondrites."
> 
> 
> Moni also asks: "are there more images available?"
> 
> Mike Farmer has a few specimens + pictures => http://www.meteoritehunter.com/
> 
> Best wishes,
> 
> Bernd
> 
> 
> 
> To: grf2 at verizon.net
>     SPACEROCKSINC at aol.com
>     meteorite-list at meteoritecentral.com
> 
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