Coincidence?

[Boo Radley]

Originally Posted by Alfirin

Islamic tradition isn't the only one that ascribes special powers to the metal of meteroites. There is a long tradtion in folklore, Eastern and Western which states that the metal of meterorites (called "thunderbolt iron") has varios mytical and magical properties, and weapons made of this iron are believed to have magic powers as well. In some versions of the Arthurian legends, Excalibur is made of thunderbolt iron. Since a healthy vein of western folklore runs through Tolkein's work, maybe thats where he got the idea. Of maybe he read Lord Dunsay's The King of Elfland's Daugher at some point which also features a thunderbolt iron sword.

You beat me to this idea by a mere... three weeks, actually.
This is how I would reason it out.