In Ultima Online, a "Small Piece of Blackrock" is a valuable and rare item found through mining or as a quest reward. These pieces have been part of various in-game events and can be used in crafting or quests, such as the "A Dish Best Served Cold" quest, where they serve as an ingredient for Blackrock Stew. Additionally, they hold historical significance within the game's lore, particularly relating to the explosion in Haven that led to the creation of New Haven. Players often collect and stack these items, although different versions do not always stack together due to item ID changes in updates​