Granite, andisite, diorite, and maybe calcite should be made from amethyst

I think, instead of the current quartz recipe, that decorative stones like granite should be made from amethyst. To make sure you get the right block, each type will have an amount of amethyst it needs to be crafted. So, andisite would need 1 cobblestone and one amethyst shards, granite would need 2 per cobblestone, diorite 3, and if it gets added calcite should need four. Alternatively, you can use an amethyst block and one cobblestone to get one calcite. Only issue with this is consistency, which maybe two cobblestone and one amethyst block could be two granite to fix that. 

I think this change will give more use to amethyst, and make renewing these blocks easier. The reason I think calcite should be made of this instead of calcium is because not only does this make it related to amethyst, but also makes it easier to get now, let alone if they add variants.