sentence: Some minerals are tested by taste.
sentences_before: Chalcanthite is easily dissolved. It is only found in dry areas. When it is in air, it loses its bright blue color.
sentences_after: 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: mineral
headings: Copper(II) sulfate Occurrence
categories: Sulfur compounds Copper compounds