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I know it feels hard...especially to other coals. You may be right about the it being too soft. I'm not sure if I agree about the coarseness. It can often time look/feel like glass. That may be...

I don't think it would crumble. Anthracite is a hard coal.

I know this a random question. I live in central Pennsylvania which is referred to as the coal region. Anthracite coal lacks imperfections so it would provide a consist sharpening surface. It is...