Fluorine: An element of the halogen class of elements which is only found in nature combined with other substances. It is found combined as calcium fluoride in fluorite, and as a double fluoride of aluminum and sodium in cryolite.
It is a fluorine aluminium silicate and comes in yellow, yellow-brown, honey-yellow, flax, brown, green, blue, light blue, red and pink ... and sometimes it has no colour at all. The topaz.
This fracture is sometimes known as "jagged" fracture halides Group of minerals containing one of the halogen elements (chlorine, fluorine, bromine, and iodine) as a building block.
It is thought to form from fluorine-bearing gases released during later stages of solidification in acidic igneous rocks, and typically is found within rhyolites and granite cavities. Yellow is the most familiar color, red the most rare.
Fluorapatite contains fluorine (F-), chlorapatite contains chlorine (Cl-), and hydroxylapatite contains the hydroxyl anion (OH-).
Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2.
Apatite is actually three different minerals depending on the predominance of either fluorine, chlorine or the hydroxyl group: calcium (fluoro, chloro, hydroxyl) phosphate.
In 1884 he turned his attention to fluorine chemistry, preparing some organic and phosphorus derivatives of that element.
Halides - Minerals containing the halogen elements, Chlorine, Bromine, Fluorine, and Iodine, as primary elements. (Halite, Fluorite)
Hardness - The relative resistance of a mineral to being scratched.
Opalized fluorite is a mineraloid which is a combination of amorphous hydrated, fluorine-rich mineralized fluids and silica-rich sediments.
The topaz is aluminum silicate that gets its color from the inclusion of oxygen, fluorine, hydrogen, silicon or aluminum. It measures an 8 on the Mohs hardness scale, making it one of the harder gemstones, not far behind sapphires and rubies.
Fluorite can also be used as a source of fluorine for hydrofluoric acid and fluorinated water. The well known element fluorine gets its name from fluorite.
Topaz is composed of silicate of aluminum containing fluorine and hydroxyl. Gem quality topaz is mostly found in pegmatite dykes. Topaz crystalstypically form prisms with a diamond shaped cross section and a pyramidal top.
Requires a source of fluorine; during the late-stage crystallization of certain types of igneous rocks fluorine vapor is present and can be trapped in pegmatites or gas cavities in volcanic rocks.
The name of the element fluorine is also derived from Fluorite. Formerly called fluorspar, fluorite has a wide range of colors including yellow, blue, pink purple and green.
The color of topaz is relative to the proportion of water or fluorine in it. More the water content in the crystals, more yellow to brown the color; and more the fluorine content, more bluish or colorless the mineral.
Industrial/economical uses:
Main source of fluorine (which is added to drinking water, toothpaste, used as a flux in industrial uses and as part of CFCs)
SulfideGalena
PbS ...
The metallic part consists of aluminum, and there are present also the non-metals fluorine and hydrogen. Here we have five elements in the one substance.
Chemical composition -- A silicate of potassium and calcium, also containing fluorine and water.
Color -- Mostly colorless or pale shades of yellow or green. Rarely dark green. Stones can be colorless in the extreme.
The website is filled with photographs and includes an overview of Guillou-Gotkovsky’s book, La Mine de Fluorine de Valzergues (1999), about the famous mine in southern France (see review here).
Gold does not react with most chemicals but is attacked by chlorine, fluorine, aqua regia and cyanide and dissolves in mercury. Gold is graded by purity; in the U.S. a scale of 24 is used, so 24 Karats (24K) is 100% pure.
The many colors of topaz are caused
by impurities, mainly fluorine and water.
Most of the familiar colors are created
by irradiation and heat treatment.
This group is composed of three different minerals depending on the predominance of either fluorine, chlorine or the hydroxyl group.
green light when heated), Yttrofluorite (yttrium replaces some of the calcium - formula = [Ca,Y]F2), Yttrocerite (cerium and yttrium replaces some of the calcium in its structure - formula = [Ca,Ce,Y]F2, Antozonite (contains uncombined fluorine ions ...
 See also: Mineral, Crystal, Water, Stone, Color
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