Slate is a resource obtained primarily by breaking rocks in the Mines, particularly on levels 41-79. It can also be found in fishing treasure chests or as loot from certain monsters. This gray stone is used in various crafting recipes and can be sold for a modest price. Additionally, it may be requested for Fish Pond quests, where it serves as a construction material to increase the pond's capacity.
The item ID for Slate is 576
This ID will work on PC/Mac (Steam), PS4, PS5, XBOX One, and Nintendo Switch.
Spawning items in Stardew Valley is a little unsual and is not done with commands. You will need to utilize what is called a cheat to set your character's or animal name to the item id. To do this you cannot use just the item id, you will need to surround the item id with brackets. Ex. [576]
Spawning Using the Animal MethodTo spawn Slate while using an animal, you will need to head over to Marine's Ranch and purchase an animal. Once you have have an animal chosen, name the animal with the item id with brackets like this [576] and you will receive the Slate item. This method can be done using an existing character and is convenient but will cost some gold every time you want an item.
Spawning Using the Character MethodTo spawn Slate while using a character, you will need to create a new character and name it with the item id with brackets like this [576]. You will then receive the Slate item when you speak to a villager. This method is easy and free but cannot be performed on an existing character and you will be stuck with that name unless its edited.