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Fluorite

Introduction

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Fluorite is a gemstone with a veritable and amazing colors that range from green, red, green, blue, yellow-colored, colorless, brownish, lilac, to lilac red. Fluorite should get the name "The Most Vibrant Mineral in the World" by all means. Fluorite lights up when warmed and fluoresces under ultra violet light. Fluorite, with a hardness score of 4 on Mohs range, is a rather soft gemstone that should only be used for charms, brooches or pendant jewelry.
Historical Romans considered that consuming alcohol consumption from mugs designed and carved of fluorite avoided drunkenness.

Fluorite Color
The rich purple shade is by far fluorite's most popular and well-known shade. It easily plays with the wonderful green of amethyst. The red, green and yellow-colored types of fluorite are also greatly shaded, well-known and eye-catching. The colorless variety is not as well obtained as the shaded types, but their scarcity still makes them popular by gemstone collectors. The unusual colors of red (rose) are eye-catching, command high price per carat and in demand.

Color Change Fluorite is an attractive stone with an intense color change effect.  When illuminated with incandescent light, the Fluorite is a lovely rose, pink or purple color. Under fluorescent light the gem often appears vivid blue similar to top Swiss blue topaz...

Though Color Change Fluorite's low hardness and good cleavage has limited its use in jewelry, its variable colorations and large sizes have nonetheless captivated jewelry designers and carvers the world over.  Fluorite is most suitable for pendants and earrings which are not subject to wear and possible knocks / abuse.

The prices and value of Color Change Fluorite can vary tremendously, depending on the size and quality of the gemstone.



Fluorite is regularly glow under ultra violet light (UV) and,its fluorescence colors are incredibly varying. Generally it fluoresces blue but other fluorite colors ma exhibit yellow, red, white-colored and green.
Another optical characteristic of fluorite is its thermo luminescence. Thermo luminescence is the ability to glow when heated. A variety of fluorite known as "chlorophane" (which means to show green) can demonstrate this property very well and will even thermoluminesce while the specimen is held in a person's hand activated by the person's own body heat (of course in a dark room, as it is not bright enough to be seen in daylight). The thermo luminescence is green to blue-green and can be produced on the coils of a heater or electric stove top. Once seen, the glow will fade away and can no longer be seen in the same specimen again.

Clarity
Fluorite has a vitreous luster and should be free of inclusions.

Cut
Fluorite comes in various shapes and cuts. Because of the low hardness (4 Mohs scale) and its tendency to chip, cutters have to work very carefully.

Fluorite location and deposits
The gem Fluorite are found worldwide for instance, in Argentina, Austria, Canada, China, England, France, Germany, Mexico, Morocco, Myanmar, Namibia, Russia, Spain, Switzerland and the United States.

Chlorophane type fluorite is found in very restricted amounts at Amelia Trial House, Virginia; Franklin, New Jersey and the Bluebird Mine, State of phoenix ( AZ ), USA; Gilgit, Pakistan; Mont Saint-Hilaire, Quebec, north america,, Canada and at Nerchinsk in the Ural Hills, Russia

Common Fluorite treatments
Color can be changed with gamma rays and that including pink, color change, blue, or green varies of fluorite.

Fluorite gemology
Species: Fluorite
Color: Colorless, all colors
Chemical composition: CaF, calcium fluoride
Crystal system: (Cubic) cubes, octahedral
Hardness: 4 (Mohs scale)
Specific gravity: 3.00 - 3.25
Refractive index: 1.434
Birefringence: None 
Optical character:
Color of streak: White 
Absorption spectrum: 634, 610, 582, 445, 427
Fluorescence: Strong; blue-violet

Precautions and limitation for jewelry usages

Heat/ thermal sensitivity- As most of green and blue’s colors caused by radiation that occurs both naturally and from the treatment, so it’s not advisable exposure this stone to high temperature. For instance high temperature from polishing wheel, certain type of plating solutions as this may cause the stone to lose their color.

Because of the low hardness (4 Mohs scale) and its tendency to chip, setters have to work very carefully.