Interesting subject, I bought a piece of Erythrite which I have read contains Arsenic (a poison). I've bought this for a xmas gift for my mother but I'm certainly going to warn her that she mustn't handle this stone without washing her hands afterwards. I'm still in two minds about letting her have it but my mum very rarely handling any crystals/gemstones that I give her, she just keeps them by her chest of drawers next to her bed.
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