fluorite
purple fluorite from U.S.
pink fluorite crystal of Pakistan
fluorite in nodules from Pakistan
octahedra of fluorite in China
cubic transparent fluorite crystal from Dalnegorsk in Russia
two color fluorite from Argentina rectangular cut
gas-liquid type inclusions in crystalline gaps
fluorite crystals in inclusion in a quartz from Madagascar
Detailed sheet
fluorite
It is known since antiquity, its name comes from the Latin verb “fluere” which means “ to flow “ because it was already used as a flux in metallurgy. The composition evokes the name of this mineral: it contains fluorine, an element which was so named after that of fluorite in which he was identified. It gave its name to fluorescence … and it also presents the phenomenon of thermoluminescence: when heated, it emits light, a feature that has always made it an amazing stone, even magical … It may have areas of different color on the inside of a single crystal. the famous murrhine vases were made of it, Pliny named it ‘murrhe “. There is a blue-yellow banded variety called ” blue John “, in England, which was widely used in the decorative arts until the nineteenth century. It is the standard hardness of 4 on the Mohs hardness scale ranging from 1 to 10.
CHEMICAL CHARACTERISTICS
Ca F2
calcium fluorure
PHYSICAL CHARACTERISTICS
Main color
silvery
Other colors
white, blue, grey, colourless, yellow, orange, pink, red, green, purple
all the existing colors
Color of streak
white
Luster
vitreous
Hardness
4.0 to 0.0
Density
3.00 to 3.25
Cleavage
perfect
Fracture
uneven
very easy cleavage in all 3 dimensions
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.430 - 1.450
Double refraction
0.000
none, isotropic
visible double refraction
No
Dispersion
0,007(0.004)
Pleochroism
absent
Number of colors
1
Absorption spectrum
634 - 610 - 582 - 445 - 427
for the green one
Fluorescence
variable
it can only be fluorescent, colors vary according to the origin and can be spectacular
CRYSTALS PROPERTIES
in cubes, perfect octahedra. Sometimes compact, banded, scalloped.
crystals system
cubic
OTHER INFORMATIONS
Astrological sign
Gemini, Taurus
APPROACHING GEMS
Exploited
sites
This is a very common stone. It is found in France: at Le Beix near Bourg-Lastic, Alban in the Tarn, in the Mont-Blanc in rose octahedrons, Germany, Myanmar, Namibia, China, England (Cumberland), Austria , Switzerland, United States (Illinois), Argentina, Peru, Spain (Berbes, La Collada), Namibia …
use in jewelry
The gems varieties are cut in strips of two different colors, this is a very fragile collection stone because of its excessively easy cleavage and low hardness.
Banded varieties are used to make decorative objects and even architecture as the green balustrades at the Paris Opera.
In Asia, well colored and transparent varieties are skillfully cut into vases, snuff boxes, and animal sculptures.
The green fluorite has been called “emerald of Africa” : this appellation is prohibited in jewelry.
Daily care
and precautions
Very fragile, it cleaves spontaneously to heat or shock. A crystal exposed to hot sun can cleave spontaneously if a sudden temperature change occurs, as if put in cold water. Some lose their intensity or change color in the sun … that they sometimes get back after staying for a while in the dark.
imitations and
treatments
We know how to synthesize fluorite, an X-ray irradiation causes color changes.
Historical
healing properties
It would be an energy stone, that of order, which easily transmits its energy both mentally and physically by providing wisdom, harmony and ponder. It would give confidence, would help positive thinking. In ancient times it was accredited the power to discern truth. Blue fluorite would help to understand complex situations and resolve them. Its many cleavages produce perfect geometric shapes and the make of it the stone of ordered construction for architects, it is credited with the ability to help the careless to become ordered! The corresponding signs are : to the colorless fluorite, Taurus and Libra, to the blue: Cancer and Capricorn, for yellow: Sagittarius and for the green: Virgo and Gemini.
Other
Gems
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