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.
Cnidium is a plant that is native to China. It has also been found in the US in Oregon. The fruit, seed, and other plant parts are used as medicine. Cnidium has been used in Traditional Chinese Medicine (TCM) for thousands of years, often for skin conditions. Itâs not surprising that cnidium is a common ingredient in Chinese lotions, creams, and ointments.