The Redlon is a crop added by Thaumic Bases. It grows like a Melon and the Block of Redstone it bears can be mined normally with a pickaxe.
Even though thaumaturgy is a magical art and is not related to industry in any way a lot of magical devices can actually operate or be controlled by that mythical red dust - the Redstone. Actually redstone seems pretty magical itself. What if you combine it with a plant? Well, the result is a plant, that will slowly grow a Block Of Redstone, just like a Melon or a Pumpkin. It however requires much more time than melons or pumpkins.