11. When were synthetic zeolites first made?

During the 1930's, R. Barrer and J. Sameshima did extensive work in zeolite synthesis. In 1948, Richard Barrer first produced a synthetic zeolite that did not have a natural counterpart. At approximately the same time, Milton made the first materials that had no natural counterpart such as zeolite A.

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1. What are zeolites?
2. When were zeolites discovered?
3. What are some of the major applications for zeolites?
4. How do zeolites function as ion exchangers?
5. How many types of zeolites are there?
6. Are zeolites stable?
7. How do zeolites separate molecules?
8. Are zeolites re-useable?
9. How can zeolites be modified?
10. In what forms are zeolites available?
11. When were synthetic zeolites first made?
12. Are new zeolites still being discovered?
13. What makes zeolites special when compared with other inorganic oxide materials?
14. What are the health and safety aspects of zeolites?