rocks&stuff

a simple mod that adds a few new stone types and features around the world. the new stone types are limestone, marble, and slate. they all have a polished and brick variant. there is also quartz geodes that spawn around the overworld. they have a new type of quartz. this type of quartz has no uses yet but I will add them eventually. there are slate rocks that spawn around the overworld and limestone deltas that spawn in rivers.