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

[Jonathan E. Dongell]

Greg,
Guess I owe you a milkshake............
I thought you were asking what type of environment (i.e. from an external 
source)
might cause a stoney to change color over time. In other words, to cause
redoximorphic features. We see this a lot in my line of work. So, I assume
it must happen to stoneys as well, over time. I did not understand you were
asking about existing-material colorations. MY BAD : o (

May I recommend Cold Stone or Baskin Robbins......... : o }
Jon Dongell
ICMA 3922



----- Original Message ----- 
From: "Michael Gilmer" <meteoritemike at gmail.com>
To: "Thunder Stone" <stanleygregr at hotmail.com>
Cc: <meteorite-list at meteoritecentral.com>
Sent: Wednesday, March 30, 2011 9:20 AM
Subject: Re: [meteorite-list] Color of OC's by Staining or by Trace Elements


> Hi Greg and List,
>
> Great question Greg.  I'm curious to hear what the experts have to say.
>
> Some OC's start out as white or light-grey - like some LL6 types.
> That is why some LL6 meteorites are mistaken for lunars or eucrites -
> because they lack chondrules and have that whitish color.
>
> Best regards,
>
> MikeG
>
> ----------------------------------------------------------------------
> Mike Gilmer - Galactic Stone & Ironworks Meteorites
>
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> -----------------------------------------------------------------------
>
>
>
> On 3/30/11, Thunder Stone <stanleygregr at hotmail.com> wrote:
>>
>> 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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