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What is Fluorite? Fluorite is an important industrial mineral composed of calcium and fluorine (CaF2). It is used in a wide variety of , metallurgical and ceramic processes. Specimens with exceptional diaphaneity and color are cut into gems or used to make ornamental objects. Fluorite is deposited in veins by hydrothermal processes. In these rocks it often occurs as a gangue mineral associated with metallic ores. Fluorite is also found in the fractures and cavities of some limestones and dolomites. It is a very common rock-forming mineral found in many parts of the world. In the mining industry fluorite is often called "fluorspar.".
Fluorite is very easy to identify if you consider cleavage, hardness and specific gravity. It is the only common mineral that has four directions of perfect cleavage, often breaking into pieces with the shape of an octahedron. It is also the mineral used for a hardness of four in the Mohs Hardness Scale. Finally, it has a specific gravity of 3.2 which is detectably higher than most other minerals. Although color is not a reliable property for mineral identification, the characteristic purple, green and yellow translucent to transparent appearance of fluorite is an immediate visual clue for the mineral..
Fluorite typically glows a blue-violet color under short-wave ultraviolet and long-wave ultraviolet light. Some specimens are known to glow a cream or white color. Many specimens do not fluoresce. Fluorescence in fluorite is thought to be caused when trace as of yttrium, europium, samarium or other elements substitute for calcium in the fluorite mineral structure..
Most fluorite occurs as vein fillings in rocks that have been subjected to hydrothermal activity. These veins often contain metallic ores which can include sulfides of tin, silver, lead, zinc, copper and other metals. Fluorite is also found in the fractures and vugs of some limestones and dolomites. Fluorite can be massive, granular or euhedral as octahedral or cubic crystals. Fluorite is a common mineral in hydrothermal and carbonate rocks worldwide..
In 1852, George Gabriel Stokes discovered the ability of specimens of fluorite to produce a blue glow when illuminated with light, which in his words was "beyond the violet end of the spectrum." He called this phenomenon "fluorescence" after the mineral fluorite. The name gained wide acceptance in mineralogy, gemology, biology, optics, commercial lighting and many other fields. (See photo pair at right for an example of fluorite fluorescence in tumbled stones.).

Approx. 5" * 4" * 3" Weighs 1.3 kgs approx. (1.5 kg with stand) Fluorite has a wide variety of uses. The primary uses are in the metallurgical, ceramics and industries; however, optical, lapidary and other uses are also important. Fluorspar, the name used for fluorite when it is sold as a bulk material or in processed form, is sold in three different grades (, ceramic and metallurgical). Grade Fluorspar grade fluorspar is a high purity material used by the industry. It contains over 97% CaF2. Most of the fluorspar consumed in the United States is grade even if it is used in lower grade applications. It is used mainly in the industry to manufacture hydrofluoric (HF). The HF is then used to manufacture a variety of products which include: fluorocarbon s, foam blowing agents, refrigerants and a variety of fluoride s. Ceramic Grade Fluorspar Ceramic grade fluorspar contains between 85% and 96% CaF2. Much of this material is used in the manufacture of specialty glass, ceramics and enamelware. Fluorspar is used to make glazes and surface s that produce hard glossy surfaces, opalescent surfaces and a number of other appearances that make consumer glass objects more attractive or more durable. The non-stick cooking surface known as Teflon is made using fluorine derived from fluorite. Metallurgical Grade Fluorspar Metallurgical grade fluorspar contains between 60 and 85% CaF2. Much of this material is used in the production of iron, steel and other metals. Fluorspar can serve as a flux that removes impurities such as sulfur and phosphorous from molten metal and improves the fluidity of slag. Between 20 and 60 pounds of fluorspar is used for every ton of metal produced. In the United States many metal producers use fluorspar that exceeds metallurgical grade.

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