David, just to clarify a point:- I specifically omitted any reference to keris for the simple reason that it just makes the question more difficult to answer.
Yes, this Forum is about keris, but it is a complete impossibility to begin to understand the keris without getting involved in multiple other fields. One of those fields is metallurgy.
So, if we could identify, or not identify, iron-nickel material from a meteoric source after it has been subjected to high temperature processing, but before combination with other materials, that then becomes our starting point for ID of such material after combination with other materials.
However, just to focus on the question relative to keris for a moment.
There is a belief in Central Jawa that certain aspects relating to the feel of pamor on a blade will indicate its source.
In respect of the quantity of meteoritic material used in pamor, this was probably not always only a tiny amount. In the keris that I made the billet of meteoritic material for, the actual meteoritic material was around 50% of the total pamor material.
I have a keris that it is probably attributable to Jayasukadgo, a Surakarta Karaton Empu from circa 1900. The pamor of this keris is very white and quite unlike any other pamor I have seen, it is difficult, if not impossible to identify any iron content in this pamor, additionally it passes the "touch test" for meteoritic pamor that is used in Central Jawa.
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