In each vast field, you will find trees, flowers, rocks, and other natural objects, as well as many man-made or artificial objects. Some of these objects offer synthesis materials, and there are many ways to obtain them. The method you use can change the materials you find. Explore every corner of the world, and search for the rarest of items!
These large rocks on the plains give you stone type materials. Break them with your staff to get them!
You can also use an item to break them. This will consume an item, but you might find rare materials?
*Images are from the PlayStation®4 development version.