http://resource.geosciml.org/classifier/cgi/commodity-code/barium
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| definition | Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline earth metal. Because of its high chemical reactivity barium is never found in nature as a free element. Its hydroxide was known in pre-modern history as baryta; this substance does not occur as a mineral, but can be prepared by heating barium carbonate. | ||||||
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| source | http://en.wikipedia.org/wiki/Barium | ||||||
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