The English word fluorite is a derivative of the Latin word 'fluere', which translates into 'flow'. Fluorite is referred to as fluorspar and is a mineral variation of calcium fluoride (CaF2). Fluorite is a member of the halide mineral group, forming in areas that contain felsic igneous rocks. Fluorite develops in vein deposits by hydrothermal activity (sources of hot water that reside in the earth’s crust). Fluorite’s neighboring crystals during this common formation can include quartz and calcite. Fluorite rates a 4 on the Mohs scale of hardness, which makes it a softer mineral.