sparks

Does anyone know where iron pyrites can be found naturally? I am actually a geologist but I don’t know what rocks these occur in. I know that you can find pyritised fossils along the Jurassic coast in Dorset but don’t think I’ve found a nodule there. one internet source mentioned you can find...

Inspired by this thread I decided to modify the broken off end of a file. After a an hour or so on the Aldi grinder I ended up with this: My first efforts using the piece of file showed me that the striking edge really needs to be curved. (I figure the radius should be about 1...