var headTags = document.getElementsByTagName("head"); The monolithic catalyst as a novel kind of catalyst with the internal structure of a regular honeycomb structure exhibits some advantages compared with the conventional particulate catalyst. This mineral is readily available. Cordierite-Sekaninaite Series. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Crystallography : Orthorhombic, a = 17.13, b = 9.80, c = 9.35, Z = 4; space group C2/c2/c2/m; point group 2/m2/m2/m. The surface area of acidic montmorillonite/cordierite catalysts increases greatly as acidic montmorillonite loading increases due to higher surface area of acidic montmorillonite. drag2 - RMB Resize/Rotate I - Data Info var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... …example, one type of ceramic, cordierite (a magnesium aluminosilicate), is used as a substrate and support for catalysts in catalytic converters. } Keyboard The Mg analogue of Sekaninaite. { Cordierite is sometimes called dichroite because of its marked pleochroism (different coloured light is transmitted in different directions). Lamellar twinning is common. © Tom Loomis / Dakota Matrix, Mouse Pleochroic halos around zircon inclusions are diagnostic. I certainly love this website. For any gemstone crystal, Cordierite Optical Properties are responsible for imparting various physical properties to its structure. Highly, Crystals, which are uncommon, are wide and stubby or, The transparent gem variety of Cordierite is known as. if (gAutoPrint) Pleochroic halos around zircon inclusions are diagnostic. quartz). Cordierite is also called Iolite, Dichroite or also “water sapphire” due to its sapphire that is frequent blue. Related Minerals : Cordierite is structurally similar to beryl, and is chemically and structurally similar to osumilite, 1K,Na21Fe,Mg221Al,Fe231Si,Al212O30 . The cleavage of cumene hydroperoxide (CHP) in a conventional fixed-bed reactor was chosen as a model reaction to evaluate the catalytic activity of the monolithic catalysts. Cordierite is often altered to pinite. These crystals are not gemmy enough to be called iolite. html += headTags[0].innerHTML; html += printReadyElem.innerHTML; Cordierite slate Slate is a low-grade metamorphic rock generally formed by the metamorphosis of mudstone, shale, or sometimes volcanic ash, under relatively low pressure and temperature conditions (prehnite-pumpellyite facies). The hexagonal high-temperature dimorph of cordierite is indialite. Cordierite often alters to a fine-grained mass called pinnite.

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It comes in both massive and crystalline form, with color ranging from blue to g old.

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With increasing metamorphic grade increases in muscovite grain-size transforms slate into phyllite. Leave a comment Scale: 24x20x15 mm. Optical Properties : In thin section, cordierite may be clear or pale blue-violet. The results indicated that the obtained acidic montmorillonite/cordierite monolithic catalysts were firm and compact, and the loading of acidic montmorillonite was found to reach 40% (by mass) after three coating operations. function printSpecial() JP4537238B2 - Method for measuring cleavage index of kaolin particles and method for producing cordierite honeycomb structure - Google Patents Method for measuring cleavage index of kaolin particles and method for producing cordierite honeycomb structure Download PDF Info Publication number JP4537238B2. html += '\n\n\n'; else As observed in the figure, cordierite has characteristic diffraction peaks at 10.6°, 18.2°, 26.5°, 28.6°, 29.6° and 34.1°. This article was most recently revised and updated by, Amethyst Galleries' Mineral Gallery - The Mineral Cordierite. https://doi.org/10.1016/j.cjche.2014.06.006. The preliminary study shows that the catalysts exhibit excellent catalytic performance, which makes monolithic catalysts become more competitive.Download : Download full-size image. Optical Properties : In thin section, cordierite may be clear or pale blue-violet. From the French mining engineer and geologist P. L. A. Cordier (1777-1861). Ask about Cordierite here : A high-temperature polymorph exists, indialite, which is isostructural with beryl and has a random distribution of Al in the (Si,Al)6O18 rings. Read more about Iolite healing properties information and view the photo galleries below. Mg2+, Fe2+, and Al3+ link the rings to each other. Color : indigo to gray-blue. Cordierite cleavage is nothing but the plane across which the crystal splits during cutting. printWin.print(); Precambrian deposits of the Laramie Range, Wyo., U.S., contain more than 500,000 tons of cordierite. 545 Views. Location: Mt. Iolite (Cordierite) is a member of the Silicates family. alert("Could not find the printReady section in the HTML"); Rockhounds Discussion Group on Yahoo Groups Cleavage/Fracture : fair prismatic (010), poor (100)/conchoidal.

The influences of acidic montmorillonite loading, reaction temperature, CHP concentration, and weight hourly space velocity (WHSV) on the catalytic activity and selectivity of phenol were studied. html += '\n\n'; ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Scale: Overall: 2 x 1 x 1.5 cm.

It typically occurs in thermally altered clay-rich sediments surrounding igneous intrusions and in schists and paragneisses.

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