Molybdenum is one of my favorite elements, especially in Molybdenite. By it's self it isn't very strong but it does enhance some chemical properties of other metals. http://minerals.usgs.gov/minerals/pubs/commodity/molybdenum/I really enjoy all your element art.
Cubic zirconium is its oxide, similar to aluminum oxide (sapphire).Niobium: mostly used in superconductors.
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