Ferro Rod Question

Yep......it's been done with obsidian and even glass. A ferro rod makes the spark on it's own. Just needs any sharp edge to peel some off, as Dwane said.

A flint and steel, on the other hand, needs to be carbon steel as it's actually the hard flint that's shaving off a small piece of the steel. It's the steel itself that burns or sparks in that case.
 
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