Assertion: cobalt | /r/CapableOf | merge with sulfur
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Source sentences:
text: Cobalt can also merge with arsenic and sulfur to bond with iron in a molecule with the formula (CoFe)AsS. Cobalt's ability to bond with so many other valuable elements has caused miners much grief, according to Pomona College, as it can be mistaken for silver and when melted down forms poisonous gases.