The coal blocks could be a true black rather than wool-black or purple-black.kind of a black version of the redstone block. They could also work as cheapo netherrack- burning for a finite but large time. the quartz block could be like a better version of glass- very clear and very shiny- make the enchant glimmer work on the block once placed in the world. Neither is needed, but they'd be good for looks. I do support the quartz more.
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