sentence: Many people collecting minerals want it.
sentences_before: Chalcanthite has a sweet metal taste. It should only be tasted carefully, as it is poisonous. Its Mohs hardness is 2.5. It is the pentahydrate of copper sulfate. It is blue or green.
concept_name: people
headings: Copper(II) sulfate Occurrence
categories: Sulfur compounds Copper compounds