[2023] Stone to Sand Recipe

It does show in the Ecopedia in your screenshot, though? The sand icon is below the "Blocks" category, it's one of the items that category. The search will hide any results not fitting your search request and only show you chapters, categories and their contents that fit the naming. In this case it is "Natural Resources" -> "Blocks" -> "Sand". There you see how to make it, recipes itselfs aren't listed separately, they are added to the objects you produce with them.