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Topic: Zircon


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In the News (Thu 22 Aug 19)

  
  zircon.htm
Tiny brownish-purple zircon crystals are found with feldspars, actinolite, chlorite and biotite in a metarhyolite within the Quinnesec Formation in an outcrop on the south side of a town road in the center of sec.
Zircon forms tiny crystals in the Dunbar Gneiss, such as is exposed on the east side of County U in the center of the W 1/2 sec.
SAUK COUNTY: Tiny white, pink and yellow zircon grains are common in heavy mineral concentrates the Precambrian rhyolite, the Baraboo Quartzite and overlying Cambrian sediments near Baraboo (Becker, 1931).
www.uwrf.edu /~wc01/zircon.htm   (909 words)

  
 Zircon - english
Zircon has long played a supporting role to more well-known gemstones, often stepping in as an understudy when they were unavailable.
Zircon occurs in a wide range of colours, but for many years the most popular was the colourless variety, which looks more like diamond than any other natural stone because of its brilliance and dispersion.
Zircon is one of the heaviest gemstones, which means that it will look smaller than other varieties of the same weight.
www.gemstone.org /gem-by-gem/english/zircon.html   (307 words)

  
 ZIRCON (Zirconium Silicate)
Zircons reputation has suffered of late due to the introduction of a diamond simulant.
Zircon resembles diamond in luster and fire and colorless zircons have been mistaken for diamonds by experienced jewelers.
The typical simple crystal of zircon is a tetragonal prism terminated with four sided pyramids at each end.
mineral.galleries.com /minerals/silicate/zircon/zircon.htm   (330 words)

  
 Gem Hut - Zircon Gemstones
Zircon and turquoise are the birthstones of the month of December.
Zircon has a high refractive index which is responsible for it's diamond like appearance.
Zircon can be distinguished from diamond by it's double refraction and by wear and tear of it's edges, as compared to diamond which is very much harder.
www.gemhut.com /zircon.htm   (166 words)

  
 Zircon Chronology: Dating the Oldest Material on Earth
For example, a few grains of zircon found in the early 1990s in a sandstone from western Australia dates back 4.2–4.3 billion years, and we know from meteorites that the Earth is not much older at 4.56 billion years.
According to Mueller, this makes zircons “the most reliable natural chronometer that we have when we want to look at the earliest part of Earth history.”; He goes on to explain that there are two ways to tell time in geology.
Then, “because zircon is more dense than almost any other mineral, we put the ground-up rock in a liquid with very high density so that only the densest minerals fall through to the bottom,” explains Henry.
www.amnh.org /education/resources/rfl/web/essaybooks/earth/cs_zircon_chronolgy.html   (1230 words)

  
 The mineral zircon
Although colorless Zircon may also be used as a Diamond fake, it is still quite valuable in its own right, as opposed to the cheap, synthetic Cubic Zirconia.
Zircon is a very popular gemstone, and gems of all different colors are cut from Zircon.
Zircon crystals are also popular among mineral collectors, especially collectors specializing in crystals.
www.minerals.net /mineral/silicate/neso/zircon/zircon.htm   (640 words)

  
 Zircon Skye Production - tel: 805.640.7995 - promotions@zirconskye.com
Zircon Skye is now up and running on Myspace and would love to include you as one of our friends.
Longtime Zircon Skye friend and client Greg Penny was nominated in the "Best Surround Sound Album" category for his masterful work on Elton John's compact disc 'Honky Château' (Universal Music Enterprises).
The first volume of Zircon Skye Production's Publishing Sampler series is complete and ready for review/consideration by TV and Film music supervisors, producers, directors, editors and independent film makers seeking diverse, high-quality "rapid clearance" music from a one-stop source.
www.zirconskye.com   (1638 words)

  
  The Zircon X11 IRC Client
Zircon is an X Window System interface to Internet Relay Chat.
Zircon has more features than you could possibly imagine and implements nearly everything that the irc II clients support as well as many other useful and interesting features.
Zircon also supports a distributed drawing board, but please do not use this when there are non-Zircon users around as they get annoyed when they cant see the pictures.
rd.business.com /index.asp?epm=s.1&bdcq=Zircon&bdcr=1&bdcu=http://catless.ncl.ac.uk/Programs/Zircon/&bdcp=&partner=2662601&bdcs=nwuuid-2662601-A6923C15-3538-B84B-81E3-B2F8372A48B4-ym   (614 words)

  
  Zircon - LoveToKnow 1911
The dichroism of coloured zircons is always feeble; the double refraction usually strong and of positive sign; and the optical properties of some zircons suggest a biaxial mineral.
Zircon fit for use as a gem-stone is often known as "noble" or "precious zircon." The red and orange stones are termed hyacinth and jacinth, whilst those of other colours, as also the colourless transparent zircons, are called jargoon (q.v.).
Zircon is an accessory constituent of many rocks, especially granite, where it appears to have crystallized at an early stage of consolidation.
www.1911encyclopedia.org /Zircon   (839 words)

  
 Mineral description : Zircon   (Site not responding. Last check: )
Zircon and albite on orthoclase, from Langesundsfjorden, Norway.
Zircon is often metamict (no crystal structure) because of the radioactivity thats destroyed the internal structure.
Zircon is a very good mineral to measure the age of rocks.
www.geology.neab.net /minerals/zircon.htm   (134 words)

  
 Zircon   (Site not responding. Last check: )
Zircon has the distinction of being one of the few substances with a refractive index higher than diamond.
The zircon gem is 75.8 carats and is from Burma.
The zircon gems at left are 23.4 and 48.3 carats and are from Sri Lanka.
hyperphysics.phy-astr.gsu.edu /hbase/minerals/zircon.html   (174 words)

  
 Thaigem.com | Info Center | Gemstone Discovery | Zircon
Zircon’s popularity began to grow in the sixth century, when Italian artisans featured the stone in jewelry designs.
During the Middle Ages, zircon was believed to contain remedial power, protecting the wearer from diseases and banishing insomnia.
A very unique characteristic of zircon is birefringence, meaning that light splits into two rays as it passes through the stone.
www.thaigem.com /dis_zircon.asp   (369 words)

  
 ZIRCON main
Prior to advent of modern gem synthetics, colorless zircon was the stone of choice as a diamond simulant because of its diamond-like optical properties.
The natural radioactive decay of uranium and thorium within zircon damages the crystal lattice, sometimes to the extent that crystals become virtually amorphous, and results in an atomic structural state that is referred to as "metamict".
Zircon is present in trace quantities in nearly all intrusive igneous rocks, particularly granites, where it occurs as very small crystals.
www.geo.utexas.edu /courses/347k/redesign/gem_notes/zircon/zircon_main.htm   (544 words)

  
 Zircon Sand   (Site not responding. Last check: )
Zircon is used chiefly for facing on foundry moulds to increase the resistance against metal penetration.
Milled zircon is used in refractory paint for coating the outside of moulds.
Quartz mineral is the main constituent of the zircon bearing bed, with the presence of small amounts of feldspar, and heavy minerals (zircon, rutile, brookite, epidote and monazite) are present.
www.nra.gov.jo /minerals/zircon_sand.htm   (456 words)

  
 Zircon/zirconia refractories - Patent 4579829
The preferred chemical purity of the zircon and zirconia powders are 99.1 and 99.0 wt percent respectively (any hafnia present in the zirconia is not regarded as an impurity; silica in the zircon sand is also not regarded as an impurity).
Zircon powders with this preferred particle size distribution sinter to a high density with a low value of shrinkage during firing.
However, instead of separately milling zircon sand and zirconia particles to form this mixture, coarse zirconia particles may be added to the zircon sand at some convenient time near the final stages of the milling of the zircon powder and the composite powder batch milled until both powders coincidentally attain their preferred size distribution.
www.freepatentsonline.com /4579829.html   (4356 words)

  
 JK Schmidt Jewellers - Zircon - Kelowna, BC
Zircon has long had a supporting role to more well-known gemstones, replacing them when they were unavailable.
Zircon occurs in a wide range of colours but for many years, the most popular was the colourless variety which looks more like a diamond than any other natural stone due to its brilliance and dispersion.
Zircon is one of the heaviest gemstones, which means that it will look smaller than other varieties of the same weight.
www.jkschmidt.ca /zircon.htm   (286 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
Zircon is a mineral belonging to the group of nesosilicates.
Zircon is regarded as the traditional birthstone for December.
Zircons contain amounts of uranium and thorium (from 10 ppm up to 1 wt%) and can be dated using modern analytical techniques.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=zircon   (747 words)

  
 Zircon   (Site not responding. Last check: )
Zircon is a relatively recent addition to the list of gems that are commonly worn for personal adornment.
Metamict is a term that is applied to radioactive minerals or ones that have substituted radioactive elements in the crystal lattice that leads to disruptions in the crystal lattice and atomic arrangement within the crystal although the crystal retains its original external morphology.
When zircons are removed from their host gravels, they are commonly cloudy and clear up only after being heat treated by baking them in mud balls for several days.
csd.unl.edu /Birthstones/zircon.asp   (1183 words)

  
 Zircon
Zircon's name comes from the Arabic zargoon, meaning vermilion.Natural Zircons are one of the few Gemstones with dispersion or fire.
Zircon occurs naturally in a large range of colours including: yellow, red, orange, brown, green, and blue.
Zircon is a very good choice for jewelry but it should be stored in a separate compartment or in a jewelry bag to prevent scratching by harder Gemstones.
www.seabgems.com /zircon.htm   (243 words)

  
 Reviews in Mineralogy and Geochemistry
Today, the study of zircon exists as the pseudo-discipline of "zirconology" that involves materials scientists and geoscientists from across a range of sub-disciplines including stable and radiogenic isotopes, sedimentology, petrology, trace elements and experimental mineralogy.
In most rock types where zircon occurs it is a significant host of the rare-earth elements, Th and U. The abundances of these elements and the form of chondrite-normalized rare-earth element patterns may provide significant information on the processes that generate igneous and metamorphic rocks.
The composition of zircon and igneous and metamorphic petrogenesis
www.minsocam.org /MSA/RIM/Rim53.html   (848 words)

  
 Recovery of scandium, yttrium and lanthanides from zircon sand - Patent 5039336   (Site not responding. Last check: )
Surprisingly, despite the relatively low sublimation temperature of scandium chloride the very low level of scandium present in zircon ore is concentrated in the residue (rather than going with the vapor phase, where it would not be concentrated), making recovery of scandium from the zircon ore economically feasible.
The converting of zircon ore (zircon sand) to zirconium metal generally utilizes the following operations: chlorination, separation (to remove hafnium), rechlorination (by processing similar to the initial chlorination), reduction, distillation (magnesium chloride and Mg vaporization for their removal from the zirconium), and double (or triple) arc melting to produce an ingot.
While the scandium could be recovered from zircon ore by this process, it is of course best performed as a part of the production process for the zirconium metal, with the scandium being recovered from the crude chlorinator residue (which residue had previously been disposed of at low level radioactive waste disposal sites).
www.freepatentsonline.com /5039336.html   (2990 words)

  
 ZIRCON Chapter15. Nesosilicates
Zircon, a zirconium silicate mineral, was first reported by Vanuxem and Keating (1822b), but it is relatively rare in the ore deposits.
Zircon crystal on acid-etched anorthite from the corundum-margarite occurrence in the Franklin Marble at Sterling Hill.
Zircon is less common in the orebodies; those from the Trotter Shaft are commonly rock-locked in microcline and are brittle, and thus are commonly found in fragments.
franklin-sterlinghill.com /dunn/ch15/zircon.stm   (381 words)

  
 Let's Talk Gemstones
Zircon is the single member of the zircon group of the nesosilicates that is suitable for use as a gemstone.
Zircons thus affected are termed "metamict" and classified according to the extent of the damage sustained.
The distinctive colors of green zircon are frequently associated with the metamict state of the gemstones.
www.attawaygems.com /NMFG/Lets_talk_gemstones_zircon.htm   (1174 words)

  
 Zircon
Zircon has long had a supporting role to more well-known gemstones, often stepping in as an understudy when they were unavailable.
Zircon occurs in a wide range of colors but for many years, the most popular was the colorless variety which looks more like diamond than any other natural stone due to its brilliance and dispersion.
Zircon is projective and is a somewhat confusing stone.
www.penoir.com /stones/Zircon.html   (398 words)

  
 Multicolour.com > Gem Library > Gemstones Varieties > Zircon   (Site not responding. Last check: )
Zircon is known for its distinctive beauty in a wide variety of colors.
Zircon is a relatively hard stone with a hardness of 7.5.
Zircon is a stone of purity and innocence.
www.multicolour.com /gemstones/zircon.html   (440 words)

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