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sharpener is used for sharpening stone. Any sand rock can sharpen - gray clayey sand rock may be the best. Quartz is good also, is very rare. Granite is also available. The key is to grind the blade must be sharp and durable, and not easily get incision.
so, dreamed about grindstone?
dream grindstone
dream of whetstone, said if you want to avoid trouble, must pay more effort on the transaction.
that's dream to dream grindstone will how about introduction, hope to help you!