[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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