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

[Jonathan E. Dongell]

Oops. I left the word "sulfide" out of my response (see below)
> I'll  bet a chocolate milkshake : o ) you are seeing manganese (or Mn-Fe 
> combo) SULFIDE weathering.
> EDS can verify this.
> Jonathan
> ICMA 3922
>


----- Original Message ----- 
From: "Jonathan E. Dongell" <jdongell at cox.net>
To: "Thunder Stone" <stanleygregr at hotmail.com>; 
<meteorite-list at meteoritecentral.com>
Sent: Wednesday, March 30, 2011 6:03 PM
Subject: Re: [meteorite-list] Color of OC's by Staining or by Trace Elements


> 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.
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