The main difficulty when rocks discriminate against each other, is how hard it is to move to a better neighborhood. The oldest granits understand this, and so make allowances, but sedimentary rocks are particularly noted for their social stratification.
Various carbon arraingements have supposedly figured out a way to go to a "better" world, but since none of their neighbors have heard from them again, diamond, coal, and petrolium could all just cease to exist, for all their neighbors can tell.
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Various carbon arraingements have supposedly figured out a way to go to a "better" world, but since none of their neighbors have heard from them again, diamond, coal, and petrolium could all just cease to exist, for all their neighbors can tell.