What minerals will a penny not scratch.

hope this helps The Mohs Hardness Scale ranks the order of hardness of minerals and some common objects. For example, your fingernail can scratch the minerals talc and gypsum, with a hardness of 2 or lower. A copper penny can scratch calcite, gypsum, and talc.

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developed countries have tended to improve the environment, while developing countries have tended to damage it.