That's a bit tricky! It's hard to say definitively that *any* material is *only* found in the continental crust, as there are trace amounts of many elements and minerals in various parts of the Earth. However, some materials are much more common and characteristic of the continental crust. Here are some examples:

* Granite: This igneous rock is very common in continental crust and is rarely found in the oceanic crust.

* Aluminum: This is a major component of many continental rocks, like feldspars, and is less abundant in the oceanic crust.

* Gold: While gold can be found in small amounts in various places, it's more commonly associated with continental crust and certain geological formations.

* Diamonds: While they form deep within the Earth, most diamonds are found in ancient continental cratons, areas of extremely old and stable continental crust.

Important Note: It's worth remembering that the Earth is a dynamic system, and materials are constantly moving and being recycled. So, while certain materials are more common in the continental crust, traces of them can be found in other locations.