Wade,
Yes, we are all star dust to one degree or another. As to quirks in working with meteoric iron, yes, there are a few. The material is not homogenous and often includes very hard spots or, worst to deal with, microscopic diamond particles that chew up a file or saw. One of the unique characteristics about meteoric iron is the Widmanstatten Pattern shown in the photos. This type of crystallization in iron-nickel alloys can only happen if the cooling rate from the liquid to the solid state occurs VERY slowly...less than 1 degree Celsius per every 1000 years...a condition impossible to duplicate on earth. So, as long as the pattern is visible, it is easy to recognize that the iron is not of terrestrial origin. However, by the time I get finished cutting and polishing the pieces used for the sights, the crystalline pattern is no longer visible and I would have to re-etch them and leave them bright to make the Widmanstatten structure show up again. But a bright polished sight isn't in the cards, so I will finish them the same way I end up finishing the barrel or by using heat to darken them.
Mountainman,
The material is difficult to work with (hard and soft spots as noted above) and it has a lot of fracture lines that you need to work around. Othetwise a corner may fall of your finished sight.
Don,
The sights may be out of this world, but my shooting usually isn't. The one thing I know for sure is that the "dirt seeker" I install in every round ball works perfectly every time and, at some point in the trajectory, I have a 100% success rate for the ball to find the ground....sort of like a little lead meteorite.