To derive is defined as to come from, be created from or be developed out of something else. An example of derive is when you get the idea for a new fund raising event based on the event the previous year.
Rubidium: geological information. Rubidium is far too reactive to be found as the free metal in nature. It is relatively rare, although it is the 16th most abundant element in the earth's crust. Rubidium is present in some minerals found in North America, South Africa, Russia, and Canada. It is found in some potassium minerals (lepidolites, biotites, feldspar, carnallite), sometimes with caesium as well.
Officially a European species, Clathrus ruber is found with some regularity in northern California. A similar species, Clathrus crispus, appears in Florida and along the Gulf Coast. I suspect that reports of Clathrus ruber from southeastern North America represent Clathrus crispus.y Michael Kuo. If there were such a thing as an orange Wiffle football, it would be Clathrus ruber. You wouldn't want to hike it to a friend, however, since its interior surfaces are coated with a foul-smelling slime that attracts flies and other insects (who then disperse the mushroom's spores).