Calcite Geodes

Calcite and Tuff are some pretty awesome looking blocks, but the rarity of Amethyst Geodes makes it hard to do large-scale builds with them, So I propose the introduction of Calcite Geodes -- just small, solid pockets of Calcite surrounded by Tuff (Same size and shape of the current Granite, Andesite, and Diorite chunks, and probably just as/slightly less frequent.)