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There was a long thread about Arkansas stones a while back, that ended with the conclusions that they are very slow and death to DMT's when trying to lap them. I did not get any better results with...

That is interesting! Says that your piece of quartz is harder than the black Arkansas. So, I just borrowed an amethyst (quartz) and scratched my translucent Arkansas. (hope my wife does not read...

Thanks for trying the experiement: when I looked up how to do the scratch test properly, the scratch has to not only be visible but be able to be felt (not a deposit of material from the other...

It looks like a huge piece of gem quality quartz with lots of inclusions, resembling topaz. Try scratching it with a piece of quartz; if it does not leave a genuine scratch then your stone is...