| http://www.w3.org/ns/prov#value | - Metals that may be used include barium, strontium, tantalum, calcium, bismuth, lead, yttrium, scandium, lanthanum, antimony, chromium, thallium, titanium, hafnium, tungsten, niobium, zirconium, manganese, iron, cobalt, nickel, magnesium, zinc, and other elements.
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