Thread:707Mithrandir/@comment-28905095-20170319213052/@comment-26335978-20170319214237

Renewable means it can be infinitely made or farmed or crafted. An example: Iron is renewable because it is dropped by Iron Golems and Zombies, which will spawn indefinitely overtime. Iron Ore however, can only be obtained by mining, and because there is a finite amount of Iron ore in each world, (Not that you will ever be able to mine every piece of iron ore in a world) it is Non-renewable.

So, red sand falls into the category non-renewable because once all the red sand in a world is mined, no more of it can be obtained.

Basically, Renewable means you can get an infinite amount of said material, and non-renewable means it is not infinite, no matter how common the material.