I hate to be the one to break it to you Jim, but if you ever talked to anyone who actually does CSI type work you would find out pretty quickly just how much of that show borders on science fiction.
As far as i know there are no elements present in meteoric pamor that can not be found on earth. I think any recognizable crystalline structure that would ID a metal as meteoric would be destryed through the forging and welding process. So what would be the clue that remains to ID such metals as being of cosmic origin?
You theory about the term being an aesthetic reference is interesting, but i think this is more a case of early writers misunderstandings and repetition of the mistakes of others. I don't think meteoric pamor is meant to refer to a particular pattern or design in the pamor.