No respawn locations:
SpawningItemDescription is a spawning item that can be cleared to collect materials. Some appear by default at the beginning of the game in the Sunlit Plateau.
They can be cleared by using the Shovel (upgrade 2). When cleared, they yield Clay.
1 per day anywhere:
SpawningItemDescription is a spawning item that can be cleared to collect materials. Some appear by default at the beginning of the game in the Plaza and Forgotten Lands. One will spawn daily anywhere outdoors in the Valley.
They can be cleared by using the using the primary interaction button. When cleared, they yield 253 Pebbles.