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" <stanleygr...@hotmail.com>
To: <meteorite-list@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.
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