[meteorite-list] "golden iron color" of Aziz Habibi's new iron
bernd.pauli at paulinet.de
bernd.pauli at paulinet.de
Thu Apr 1 18:25:10 EDT 2010
Hello Aziz and Forum,
http://www.flickr.com/photos/azizhabibi/page3/
Aziz asked: "what is the process that make it looking like that"
Me too, I recall having seen that before but don't remember
exactly where, when and what ... Willamette maybe ???
I can offer three [theoretical (!)] solutions to this gold coloration:
1) the result of an etching process in situ
2) an *extremely* phosphide-rich iron
3) a combination of (1) and (2)
(1) and (3) might explain Aziz's question about "why the Widmanstätten
pattern is showing on the surface". => a result of etching (in situ)
(2) is a promising theory too because schreibersite is yellow in reflected
light. To me it looks slightly brownish and Buchwald says that "compared
to cohenite, [schreibersite] is distinctly more brownish."
Buchwald also says that "when the phosphides happen to be located in the
heat-affected alpha2 rim zone,...they will melt when rapidly reheated above
1100°C.
Just a thought, no more, no less,
Bernd
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