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Sparking hammerstone

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JoJoDapyro:
All the ones I have found locally do the same thing. It is what I have always called "Granite". They even throw a spark on Obsidian every now and again. Granite is usually about 20% quartz. There is your crystal.

nclonghunter:
D Kid, thanks for the info. I have started a thousand fires with flint and steel. I just know that the friction and steel shavings is what makes the sparks not the flint. But, you must have something sharp or hard enough to cut those shaving.

I may start charging for the ABO light show after dark at knapping events. One thing that occurred to me is a long time ago someone used pyrite to "knap flint" then saw that it was making the sparks and eventually made fire. At least it is possible a flint knapper discovered the fire use for pyrite.

Bob, I mostly noticed it when used as a striker but did see some also when abrading which is a lot less impact.

JoJo, never heard granite had quartz in it...interesting

Thanks for the replys and info!

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