Fluorite, Gibsonburg, Sandusky County, Ohio; N 5734
The name fluorite comes from the Latin word for flux, which refers to a substance that promotes flowing and combining of other materials, especially minerals and metals. And in fact the mineral fluorite is used as a flux in making steel and other metals that require the removal of impurities. Fluorite is a source of fluorine gas, which is used in the production of uranium. Some forms of fluorite crystals are used extensively in the study of light.