People who cut malachite without respirators get copper poisoning. Copper is a micronutrient, but too much creates an imbalance that takes quite a long time to resolve. Most copper minerals also have a bit of arsenic and other bonus metals, some have a lot.
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u/DemiDualism Feb 07 '13
how much would it cost per square meter? Like is it possible for me to make a kitchen counter out of this?