Assertion: cobalt | /r/HasProperty | rare metal
Facets:
Source sentences:
text: The impact on the world cobalt economy from this conflict was smaller than expected: cobalt is a rare metal, the pigment is highly toxic, and the industry had already established effective ways for recycling cobalt materials.
text: Keep in mind that cobalt is a rare metal and, thus, its prices tend to be higher because of the supply-and-demand law.