sentence: Selenium is found most in sulfide ores like pyrite.
sentences_before: Selenium is very rarely found as an element in the ground. Most selenium in soil is in a very tiny amount. It is easily washed away. It is in very small amounts in the human body.
sentences_after: This selenium is in selenides. Selenium is gotten as a byproduct. Sometimes selenium is concentrated in plants. It can also be leached into rivers when copper is mined. Too much selenium is bad for a river.
concept_name: selenium
headings: Selenium Occurrence
categories: Chemical elements Nonmetals