[meteorite-list] Color of OC's by Staining or by Trace Elements

[Jonathan E. Dongell]

I'll  bet a chocolate milkshake : o ) you are seeing manganese (or Mn-Fe 
combo) weathering.
EDS can verify this.
Jonathan
ICMA 3922


----- Original Message ----- 
From: "Thunder Stone" <stanleygregr at hotmail.com>
To: <meteorite-list at meteoritecentral.com>
Sent: Wednesday, March 30, 2011 9:11 AM
Subject: [meteorite-list] Color of OC's by Staining or by Trace Elements



Hi List:
I hope everyone is well.
I have a question regarding the 'color' of OC's through staining by some 
mineral influx or by oxidation. It appears most fresh OC's start out as a 
light beige or tan color; then through time the metal rusts and they often 
turn yellowish, orange, or brownish - this make sense. My questions is this:
What other colors can they become, blue or green? What element(s) result in 
different colors? What different weathering processes are involved?
The reason I ask is because I have a weathered meteorite that is dark green 
in color; it looks like jade and I have not seen any like this one before.
I have also and seen OC's with a 'black' color, what causes that?
Thanks,
Greg S.
______________________________________________
Visit the Archives at 
http://www.meteoritecentral.com/mailing-list-archives.html
Meteorite-list mailing list
Meteorite-list at meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list