Bloodstone is a block that consists of the primary terrain feature in Hell, as well as acting as a boundary between the Overworld and Hell. It appears as a 'Blood Red' Stone accompanied with "Scars" and a Scale-like texture. Note that after 3500 meters you will be able to go to the hell biome, the main problem with this is that you encounter more mobs and demons. Bloodstone can be used to upgrade to different weapons and the long lasting bloodstone pickaxe
Bloodstone can only be mined with a Diamond Pickaxe or higher. This means you have to make every pickaxe sequentially (Stone>Iron>Gold>Diamond) in order to mine bloodstone.
When mined, Bloodstone comes in it's purest form. It does not require a crafting recipe.