Floris van Breugel / A rock collector explores piles of fluorescent minerals found in the tailings of the Pacific Tungsten Mine near Darwin, California. The bright colours are caused by fluorescence excited by a shortwave...

Floris van Breugel / A wide variety of fluorescent minerals including scheelite (blue/white), calcite (red), silica coatings containing uranyl ions (green), fluorite (pink), and 'desert varnish' (yellow/orange), populate...

John Cancalosi / Fluorite (CaF2) (calcium fluoride) on Sphalerite (ZnS) (zinc sulfide) Elmwood Mine - Smith County - Tennessee - USA - Fluorite is a source of fluorine-used in the manufacture of milk glass-as a flux...

John Cancalosi / Fluorite (CaF2-calcium fluoride) and Galena (PbS - lead sulfide) and Quartz (SiO2 - silicon dioxide) - Blanchard Mine - Portales Tunnel - Socorro County - New Mexico -Fluorite (purple) is one of the m...

John Cancalosi / Close-up of Fluorite, Elmwood Mine, Smith County, Tennessee, USA

John Cancalosi / Fluorite (CaF2, calcium fluoride) on Sphalerite (ZnS, zinc sulfide). Fluorite is a source of fluorine-used in the manufacture of milk glass-as a flux for the steel industry and in refining of aluminum...

John Cancalosi / Fluorite with Calcite, (CaF2-calcium fluoride). Fluorite is one of the most popular minerals among collectors, Mineral class: Halides. Fluorite is a source of fluorine-used in the manufacture of milk...

John Cancalosi / Fluorite with Calcite, (CaF2-calcium fluoride). Fluorite is one of the most popular minerals among collectors, Mineral class: Halides. Fluorite is a source of fluorine-used in the manufacture of milk...

John Cancalosi / Fluorite and Galena, the primary ore of lead. Sample from Rogerley Mine, County Durham, England, UK.

John Cancalosi / Fluorite (CaF2) (calcium fluoride) on Sphalerite (ZnS) (zinc sulfide).Fluorite is a source of fluorine-used in the manufacture of milk glass-as a flux for the steel industry and in refining of aluminu...

John Cancalosi / Fluorite (CaF2, calcium fluoride), a halide mineral and one of the most popular among collectors. Used as a source of fluorine, in the manufacture of milk glass, as a flux for the steel industry and i...

John Cancalosi / Fluorite (CaF2, calcium fluoride), a halide mineral and one of the most popular among collectors. Used as a source of fluorine, in the manufacture of milk glass, as a flux for the steel industry and i...

John Cancalosi / Fluorite (CaF2, Calcium fluoride) and Galena (PbS, Lead sulphide). Rogerley Mine, County Durham, England, UK

John Cancalosi / Purple Fluorite (CaF2, calcium fluoride) fluorite, a halide mineral. Fluorite is one of the most popular minerals among collectors. Used as a source of fluorine, used in the manufacture of milk glass,...

John Cancalosi / Green fluorite (CaF2, calcium fluoride) a halide mineral. Fluorite is one of the most popular minerals among collectors and is used as a source of fluorine, in the manufacture of milk glass, as a flu...

John Cancalosi / Fluorite (CaF2 - calcium fluoride), a halide mineral popular among collectors, used in aluminium refining, the steel industry and the manufacture of milk glass.

John Cancalosi / Fluorite (CaF2 / calcium fluoride) crystals, from China, Fluorite is a source of fluorine used in the manufacture of milk glass, as a flux for the steel industry and in refining aluminum.

John Cancalosi / Fluorite crystals (CaF2 / calcium fluoride) source of fluorine used in the manufacture of milk glass, as a flux for the steel industry and in refining aluminum

John Cancalosi / Fluorite crystals (CaF2 / Calcium fluoride) from Riemvasmaak, Northern Cape, South Africa. A source of fluorine, used in the manufacture of milk glass, as a flux for the steel industry and in refini...

John Cancalosi / Fluorite crystals (CaF2 / Calcium fluoride) from Riemvasmaak, Northern Cape, South Africa. A source of fluorine, used in the manufacture of milk glass, as a flux for the steel industry and in refini...