The Stone Shovel is a shovel, a type of tool used to gather ice cubes in the winter, sand on the beach and islands of the ocean, and ground (soil) in the forest. It was added in the Vamos a la Playa update. The stone shovel can be upgraded to the Golden Shovel.
Stone Shovel can mine only one resource at a time, which can be ground, sand, or ice cubes, depending on the biome. To do this, just hold a shovel in hand and click.