'je supermarkt bepaalt je gewicht de supermarkt die je bezoekt om je boodschappen te doen, is van invloed op je gewicht. "Dead sea neighbours agree to pipeline to pump water from Red sea". 1 In Germany, the cosmetic industry generated.6 billion of retail sales in 2008, 33 which makes the german cosmetic industry the third largest in the world, after Japan and the United States. "Fluorescence of Fluorite and the bivalent Europium Ion". 1 x per dag in de ochtend. 13/7 wie start wanneer met de trainingen? 't deil vaan de biestegeneeskunde wat ziech daomèt bezeghèlt weurt veeartsenij geneump; vreuger waore die wäörd synonieme. 10 Contents Etymology and toponymy In Hebrew, the dead sea is Yām ha-mela ( meaning "sea of salt " ( Genesis 14:3).in the, jordan Rift Valley, and its main tributary is the, jordan river. 't joonk weurt e kaaf geneump.
10 Best Pasta Creme Fraiche recipes. 11 In Arabic the dead sea is called al-Bahr goji al-mayyit 5 the dead sea or less commonly bar lūṭ (, "the sea of Lot. 't Rind is 't ierste stök vee wat zie genoom in kaart gebrach zaog. (in plaats van 6 keer per jaar ziek). "How to feel like a woman, or Why punishment is a drag." ucla. "Effectiveness of climatotherapy at the dead sea for psoriasis vulgaris: A community-oriented study introducing the beer Sheva psoriasis severity Score". "Bathing in a magnesium-rich dead sea salt solution: follow-on review". 1 vlekje zat iets meer urdu op mn onderbuik en die is verdwenen. 10 In religion, art, and literature edit Other similar spaces edit Other outdoor spaces that are similar to gardens include: A landscape is an outdoor space of a larger scale, natural or designed, usually unenclosed and considered from a distance. "Saline lakes V: Proceedings of the Vth International Symposium on Inland Saline lakes, held in Bolivia, 22".
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(although my husband doesn't like the peter scent, but I think he's nuts i really enjoy taking baths now more and more as i've found it's an inexpensive way to pamper myself. "makeup makes Women Appear More competent: Study". 'ne gelubden deur hèt 'nen. "Rehabilitation of hypoxemic patients with copd at low altitude at the dead sea, the lowest place on face earth" (PDF). "The limnological history of late Pleistocene holocene water bodies in the dead sea basin" (PDF). 13 The largest documented single crystal of fluorite was a cube.12 m in size and weighing 16 tonnes. "France continues to lead the way in cosmetics".
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21 Fluorite is allochromatic, meaning that it can be tinted with elemental impurities. Fluorite comes in a wide range of colors and has consequently been dubbed "the most colorful mineral in the world". Every color of the rainbow in various shades are represented by fluorite samples, along with white, black, and clear crystals. The most common colors are purple, blue, green, yellow, or colorless. Less common are pink, red, white, brown, and black. Color zoning or banding is commonly present. The color of the fluorite is determined by factors including impurities, exposure to radiation, and the absence or voids of the color centers.
18 Many minerals, as duitsland well as other substances, fluoresce. Fluorescence involves the elevation of electron energy levels by quanta of ultraviolet light, followed by the progressive falling back of the electrons into their previous energy state, releasing quanta of visible light in the process. In fluorite, the visible light emitted is most commonly blue, but red, purple, yellow, green and white also occur. The fluorescence of fluorite may be due to mineral impurities, such as yttrium and ytterbium, or organic matter, such as volatile hydrocarbons in the crystal lattice. In particular, the blue fluorescence seen in fluorites from certain parts of Great Britain responsible for the naming of the phenomenon of fluorescence itself, has been attributed to the presence of inclusions of divalent europium in the crystal.
20 One fluorescent variety of fluorite is chlorophane, which is reddish or purple in color and fluoresces brightly in emerald green when heated ( thermoluminescence ) or exposed to ultraviolet light. The color of visible light emitted when a sample of fluorite is fluorescing depends on where the original specimen was collected; different impurities having been included in the crystal lattice in different places. Neither does all fluorite fluoresce equally brightly, even from the same locality. Therefore, ultraviolet light is not a reliable tool for the identification of specimens, nor for quantifying the mineral in mixtures. For example, among British fluorites, those from Northumberland, county durham, and eastern Cumbria are the most consistently fluorescent, whereas fluorite from Yorkshire, derbyshire, and Cornwall, if they fluoresce at all, are generally only feebly fluorescent. Fluorite also exhibits the property of thermoluminescence.
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The area with veins of known workable size comprises about 60 square miles (160 km2). Cubic crystals up to 20 cm across have been found at Dalnegorsk, russia. 13 The largest documented single crystal of fluorite was a cube.12 m in size and weighing 16 tonnes. 14 Fluorite may also be found in mines in Caldoveiro peak, in Asturias, spain. 15 "Blue john" edit main article: Blue john (mineral) One of the most famous of the older-known localities of fluorite is Castleton in Derbyshire, england, where, under the name of Derbyshire Blue john, purple-blue fluorite was extracted from several mines or caves.
During the 19th century, this attractive fluorite was mined for its ornamental value. The mineral Blue john is now scarce, and only a few hundred kilograms are mined each year for ornamental and lapidary use. Mining still takes place in Blue john cavern and Treak cliff cavern. 16 Recently discovered deposits in China have produced fluorite with coloring and banding similar to the classic Blue john stone. 17 Fluorescence edit george gabriel Stokes named the phenomenon of fluorescence from fluorite, in 1852. 18 19 Many samples of fluorite exhibit fluorescence under ultraviolet light, a property that takes its name from fluorite.
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The world reserves of fluorite are estimated at 230 million tonnes (Mt) with the largest deposits being in south Africa (about 41 Mt mexico koop (32 Mt) and China (24 Mt). China is leading the world production with about 3 Mt annually (in 2010 followed by mexico (1.0 Mt mongolia (0.45 Mt russia (0.22 Mt south Africa (0.13 Mt Spain (0.12 Mt) and Namibia (0.11 Mt). 9 One of the largest deposits of fluorspar meer in North America is located in the burin Peninsula, newfoundland, canada. The first official recognition of fluorspar in the area was recorded by geologist. He noted an occurrence of "galena" or lead ore and fluorite of lime on the west side. It is recorded that interest in the commercial mining of fluorspar began in 1928 with the first ore being extracted in 1933. Eventually at Iron Springs Mine, the shafts reached depths of 970 feet (300 m). Lawrence area, the veins are persistent for great lengths and several of them have wide lenses.
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Structure edit main article: Calcium fluoride Fluorite crystallises in a cubic motif. Crystal twinning is common and adds complexity to the observed crystal habits. Fluorite has four perfect cleavage planes that help produce octahedral fragments. Element substitution for the calcium cation often includes certain rare earth elements (ree such as yttrium and cerium. Iron, sodium, and barium are also common impurities. Some fluorine may be replaced by the chloride anion. Occurrence and mining edit a closeup of fluorite surface Fluorite is a widely occurring mineral that occurs globally with significant deposits in over 9,000 areas. 2 It may occur as a vein deposit, especially with metallic minerals, where it often forms a part of the gangue serum (the surrounding "host-rock" in which valuable minerals occur) and may be associated with galena, sphalerite, barite, quartz, and calcite. It is a common mineral in deposits of hydrothermal origin and has been noted as a primary mineral in granites and other igneous rocks and as a common minor constituent of dolostone and limestone.
Fluorite optics are also usable in the far-ultraviolet and mid-infrared ranges, where conventional glasses are too absorbent for use. Contents, history and etymology edit, the word fluorite is derived from the, latin verb fluere, meaning to flow. The mineral is used as a flux in iron smelting to decrease the viscosity of slags. The term flux comes from the latin adjective fluxus, meaning flowing, loose, slack. The mineral fluorite was originally termed fluorospar and was first discussed in print in a 1530 work bermannvs sive de re metallica dialogus Bermannus; or a dialogue about the nature of metals, by georgius Agricola, as a mineral noted for its usefulness as a flux. 5 6 face Agricola, a german scientist with expertise in philology, mining, and metallurgy, named fluorspar as a neo-latinization of the german Flussspat from Fluß ( stream, river ) and "Spat" (meaning a nonmetallic mineral akin to gypsum, spærstān, spear stone, referring to its crystalline projections). 7 8 In 1852, fluorite gave its name to the phenomenon of fluorescence, which is prominent in fluorites from certain locations, due to certain impurities in the crystal. Fluorite also gave the name to its constitutive element fluorine. 2 Presently, the word "fluorspar" is most commonly used for fluorite as the industrial and chemical commodity, while "fluorite" is used mineralogically and in most other senses.
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Fluorite (also called fluorspar ) is the mineral form of calcium fluoride, caf2. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon. Mohs scale of mineral hardness, based on scratch, hardness comparison, defines value 4 as Fluorite. Fluorite is a colorful mineral, both in visible and ultraviolet light, and the stone has ornamental and lapidary uses. Industrially, fluorite is used as a flux for smelting, and in the production of certain glasses and enamels. The purest grades of fluorite are a source of fluoride for hydrofluoric acid manufacture, which is the intermediate source of most fluorine-containing fine chemicals. Optically clear transparent fluorite lenses have low dispersion, so lenses made from it exhibit less chromatic aberration, tips making them valuable in microscopes and telescopes.