The Calcite Conundrum

Nearly everyone LOVES calcite for being a pearly white, but dirty block.
The problom with it, is the rarity.

Yes, geodes are pretty common BUT you only get about 1.5 - 3 stacks per geode. A way of keeping it rare but also easy to get, would be by doing this:

Caves in rare biomes such as Ice Spikes, mushroom biome, and bamboo forests, would have all granite, diorite and andesite replaced with Calcite. This makes it rare, but easy to get at the same time.