I agree BSMStar, so long as we're talking about ID'ing meteorite samples.
When we're trying to ID the meteoric component in a knife made of mixed terrestrial and meteoric materials, it's a bit more complex. The blade is made of:
1) the meteoric material (with a readily identifiable asteroidal fingerprint?)
2) iron from a terrestrial source, with either a known or unknown chemical fingerprint depending on age and source, and
3) carbon (for steel) from a terrestrial source, that probably contains traces of contaminants such as cesium, mercury, or whatever, depending on the source of the carbon (charcoal, coal, etc).
I'll submit that this mixture can be deciphered if 2) and 3) are known--basically, in an industrial setting, especially where the steel is purchased and contains 2 and 3 already. In a non-industrial setting, such as with a century-plus old keris from somewhere in Java, it will be extraordinarily difficult to decipher all three, since we have little idea about the source any of the ingredients.
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