lots of everyday items will spark, as long as they are high carbon steel and sufficiently hard. I've seen videos of a bloke using various tools and personally tried a few things.I have wondered what other common items could be used to spark , like when on train tracks seeing the old spikes and bolts if you were out wandering , or if a fence star picket could do the job .
Shoveling blue stone can spark too .
the quartz here gives a pretty good little spark shower .
they are a popular item, they pop up on Etsy from time to timeIf I was into the flint and steel and blacksmithing , I reckon I’d give high carbon steel striker belt buckles a go , then sell them to all the bushcrafters , so they don’t get caught cold with their pants down .