Blackstone Slab is a half-block variant of blackstone, a dark-colored block resembling stone found in the Nether. It is crafted using three blackstone blocks and can be placed horizontally against the top or bottom of other blocks. Players use it for decorative purposes, as well as for creating compact staircases and paths that allow for easier movement without jumping. It shares the same blast resistance as its full-sized counterpart, making it a practical choice for building in explosive-prone areas.
This item has no numerical item ID, therefore you must use the item ID to spawn the item. Numerical item IDs were removed in Minecraft version 1.13.
The item id for Blackstone Slab is minecraft:blackstone_slab
The item ID for Blackstone Slab is minecraft:blackstone_slab
This is the spawn command to give yourself Blackstone Slab in Minecraft which includes the Minecraft /give command. If you are using the Essentials plugin you will need to use /minecraft:give instead of /give