Crying Obsidian is a decorative block that is used to create respawn anchors. It is currently only obtainable through bartering with a piglin, Ruined Portals, and Bastion remnants. Piglins have a 9% possibility to give the player 1-3 crying obsidian when given a gold ingot. This block cannot be used to make a nether portal. Crying obsidian always releases purple particles (as if it were crying), which lights up a small area. Crying obsidian can only be mined using a diamond or netherite pickaxe. https://minecraft.gamepedia.com/Crying_Obsidian <-- to learn more about the Crying Obsidian click on the link