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

[Thunder Stone]

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.