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This listing is for a really fascinating fulgurite specimen in a display jar, including an info card detailing how fulgurite is formed and the location this specimen came from. This kit is great for avid mineral specimen collectors or beginners. It would be a perfect gift set for getting someone interested in mineral collecting and science. The 1 centimeter scale cube is for size comparison only. It is not included in the sale. The photos are of several different specimens, but this listings is for one specimen with an info card. The photos show multiple specimens to give a representation of the variety of shapes and colors in these specimens. I offer a shipping discount for customers who combine their payments for multiple purchases into one payment! The discount is regular shipping price for the first item and just 50 cents for each additional item! To be sure you get your shipping discount just make sure all the items you want to purchase are in your cart. Auctions you win are added to your cart automatically. For any “buy it now” items or second chance offers, be sure to click the “add to cart” button, NOT the “buy it now” button. Once all of your items are in your cart just pay for them from your cart and the combined shipping discount should be applied automatically. I offer a money back guarantee on every item I sell. If you are not 100% happy with your purchase just send me a message to let me know and I will buy back the item for your full purchase price. Fulgurite is a formation of melted sand and soil that is created by lightning striking the Earth. The temperature of lightning bolts frequently exceeds 50,000 degrees Farhenheit! This temperature is far above the melting point of the silica in sandy soil. When lightning strikes this type of soil it melts the silica leaving a branching, glassy cast of the lightning bolt. The fulgurite is often hollow in the center with unmelted sand stuck to the outside. This fulgurite specimen is from the sands of the Sahara Desert in North Africa. If you have any questions, do not hesitate to ask me. The following is a wikipedia entry about this mineral: FulguriteFrom Wikipedia, the free encyclopediaJump to navigationJump to search FulguriteStereo imageLeft frame Right frame Fulgsdcr.jpgParallel view (Stereogram guide parallel.png)Cross-eye view (Stereogram guide cross-eyed.png)Two Type I (arenaceous) fulgurites: a common tube fulgurite and a more irregular specimen.Stereo imageLeft frame Right frame Fulgsdcrb.jpgParallel view (Stereogram guide parallel.png)Cross-eye view (Stereogram guide cross-eyed.png)Two small Type I Saharan Desert fulgurites.[1] In a planar view the specimen on the right has a blade-like morphology, but its tubular nature is dramatically shown in a stereo view. metric attributesFulgurites (from the Latin fulgur, meaning “lightning”) are natural tubes, clumps, or masses of sintered, vitrified, and/or fused soil, sand, rock, organic debris and other sediments that can form when lightning discharges into ground. They can therefore be referred to as petrified lightning. They are classified as a variety of the mineraloid lechatelierite, although their absolute chemical composition is dependent on the physical and chemical properties of the usually granular-crystalline material providing an electrically and thermally conductive dissipation network for lightning-facilitated energy transfer. They are commonly hollow and/or branching assemblages of glassy, protocrystalline, and heterogeneously microcrystalline tubes, crusts, slags, vesicular masses, and clusters of refractory materials that often form during the discharge phase of lightning strikes propagating into silica-rich quartzose sand, mixed soil, clay, or other sediments.[2][3] Fulgurites are homologous to Lichtenberg figures, which are the branching patterns produced on surfaces of insulators during dielectric breakdown by high-voltage discharges, such as lightning.[4][5] Contents1Description2Classification3Significance3.1Paleoenvironmental indicator3.2Place in planetary processes and the geologic record3.3In material culture4Gallery5See also6References7External linksDescriptionFulgurites are formed when lightning strikes the ground, fusing and vitrifying mineral grains.[6] Peak temperatures within a lightning channel are known to exceed 30,000 K, with sufficient pressure to produce planar deformation features, or “shock lamellae,” in SiO2, a kind of polymorphism. This is also known colloquially as shocked quartz.[7][8][9] “Artificial fulgurites” can also be produced when the controlled arcing of electricity into an appropriate medium. Downed high voltage power lines have produced fulgurite-like lechatelierites, occasionally colored by copper from the power lines themselves.[10] The primary SiO2 phase in common tube fulgurites is lechatelierite, a silica glass also found in impactites, but many other glasses may result from the processes involved with the production of fulgurites given their chemical context. Because their groundmass is generally amorphous in structure, fulgurites are classified as mineraloids. The optical properties (color, surface texture modulation) of fulgurites vary widely, depending on bulk composition, refractory inclusions, interface dynamics, and chemical “impurities,” among other possible sources of variation. Most natural fulgurites fall on a spectrum from colorless (transparent), to white, to black; moderate iron oxide content, among other factors, can result in a deep brownish-green coloration. More colorful variants are usually synthetic and reflect incorporation of synthetic materials. The interior of Type I (sand) fulgurites normally is very smooth or lined with fine bubbles, while other types are often both vesicular and dense, almost pore-free, or even scoria-like; their exteriors generally can be coated with rough sedimentary particles or small rocks and can be porous, smooth, or topologically-complex. Branching fulgurites display fractal-like self-similarity and structural scale invariance as a macroscopic or microscopic network of root-like branches, and can display this texture without central channels or obvious divergence from morphology of context or target (e.g. sheet-like melt, rock fulgurites). Fulgurites formed in sand or loose soil are mechanically fragile, making the field collection of large specimens difficult. Other fulgurite classes are often very durable and may withstand a long residence in the geologic record, an issue of some contention in planetary sciences, such as impact geology. Fulgurites can exceed tens of centimeters in diameter and can penetrate deep into the subsoil, sometimes occurring as far as 15 m (49 ft) below the surface that was struck, but may form directly on appropriate sedimentary surfaces.[11] One of the longest fulgurites to have been found in modern times was a little over 4.9 m (16 ft) in length, and was found in northern Florida.[12] The Yale University Peabody Museum of Natural History displays one of the longest known preserved fulgurites, approximately 4 m (13 ft) in length.[13] Charles Darwin in The Voyage of the Beagle recorded that tubes such as these found in Drigg, Cumberland, UK reached a length of 9.1 m (30 ft).[14][15] The Winans Lake fulgurite[s] (Winans Lake, Livingston County, Michigan), extended discontinuously throughout a 30 m range, and arguably includes the largest reported fulgurite mass ever recovered and described – its largest section extending approximately 16 ft (4.88 m) in length by 1 ft in diameter (30 cm).[3][16] ClassificationFulgurites have been classified by Pasek et al. (2012)[17] into five types related to the type of sediment in which the fulgurite formed, as follows: Type I – sand fulgurites with tubaceous structure; their central axial void may be collapsedType II – soil fulgurites; these are glass-rich, and form in a wide range of sediment compositions, including clay-rich soils, silt-rich soils, gravel-rich soils, and loessoid; these may be tubaceous, branching, vesicular, irregular/slaggy, or may display a combination of these structures, and can produce exogenic fulgurites (droplet fulgurites)Type III – caliche or calcic sediment fulgurites, having thick, often surficially glazed granular walls with calcium-rich vitreous groundmass with little or no lechatelierite glass; their shapes are variable, with multiple narrow central channels common, and can span the entire range of morphological and structural variation for fulguritic objectsType IV – rock fulgurites, which are either crusts on minimally altered rocks, networks of tunneling within rocks, vesicular outgassed rocks (often glazed by a silicide-rich and/or metal oxide crust), or completely vitrified and dense rock material and masses of these forms with little sedimentary groundmassType V – [droplet] fulgurites (exogenic fulgurites), which show evidence of ejection (e.g. spheroidal, botryoidal, filamentous, or aerodynamic),[2][18] related by composition to Type II and Type IV fulguritesSignificancePaleoenvironmental indicatorThe presence of fulgurites in an area can be used to predict the prevalence of lightning over the particular area over a certain period of time, which in turn can help in understanding the past climates, in the study of paleolightning.[1] For instance, the fact that fulgurites are abundant in the central Sahara Desert, where thunderstorm activity is very rare, demonstrates that thunderstorms were once more frequent in that region. As their spatial distributions guide reconstruction of convection and precipitation patterns, their bulk chemistry may lead to inferences about surface sediments and generally porous structures enclose and preserve samples of the ancient atmosphere in which they formed.[19] Analysis of LIRM anomaly (see paleomagnetism) and reconstruction of ancient environmental conditions are motivations for the identification and study of fulgurites.[20] Place in planetary processes and the geologic recordMany observations have been made in fulgurites of high-pressure, high-temperature materials more commonly assumed to be exclusive to meteoritic sources, products of asteroid impacts, comet airbursts, or cosmic dust. Such materials – as a suite – formerly considered to be unique to hypervelocity impacts, have been identified in fulgurites, including highly reduced silicon-metal alloys (silicides), the fullerene allotropes C60 (buckminsterfullerene) and C70, as well as high-pressure polymorphs of SiO2, collectively known as shocked quartz, in fulgurites.[3][7][16][21][22][23][24][25][26][27][28][29][30] Reduced phosphorus as phosphides and phosphites has been identified through quantitative analyses of a representative sample of 10 fulgurites recovered from most continents, in the form of schreibersite (Fe3P, (Fe,Ni)3P) – otherwise extremely rare on Earth, but relatively common in meteorites, comets, interplanetary dust, and some planetary bodies – and TiP, which is unique to fulgurites, among other unusual compounds resulting from supercritical non-equilibrium.[3][31][32] In material cultureA fulgurite was found within the contents of the ash altar at the temple of Lykaian Zeus at Mount Lykaion in Greece. It may be associated with ritual activity performed there.[33][34][35] Fulgurites are appreciated by many for their value as tangible evidence of lightning strikes.[36] Fulgurites are also popular among hobbyists and collectors of natural specimens.[37]
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