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| CLINOBRONZITE EVOLUTION AND THE THERMAL OF THE STEINBACH METEORITE ARCH M. REID, RICHARD J. WILLIAMS and HIROSHI...version received February 18, 1974 Steinbach is a stony-iron meteorite with approximately equal amounts...Widmanstiitten structure. The silicate portion contains tridymite, orthobronzite, and clinobronzite that formed...protobronzite. The assemblage orthobronzite-protobronzite-tridymite-metallic iron indicates an equilibrium temperature...the 700-500°C range. 1. Introduction The Steinbach meteorite was found in 1724 but may have fallen around |
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| Dove On the Sequence of Phase Transitions in Tridymite Received: 20 April 1998 / Accepted: 3 September...Abstract We consider the phase transitions in tridymite from the perspective of the rigid unit mode model...consider the normal phase transition sequence in tridymite on cooling, HP LHP ..., as a successive condensation...words Tridymite ´ Rigid unit modes ´ Phase transitions Introduction The silica polymorph tridymite is notable...results from the many experimental studies on tridymite over the years (Cellai et al. 1994; de Dombal |
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| MINERALOGIST, VOL, 52, MARCH-APRIL, 1967 NEW DATA ON TRIDYMITE R.q.vx{oNrW. GnaNr, DepartmentoJ Geology,Uniaersity...chemical composition of natural tridymite is poorly known. Of the ten tridymite analysescited by Frondel (1962)...analysis of tridymite is given b1' Sato \1962). Chemical, x-ray, and optical data on tridymite from two...given in this paper. One specimenis of the meteorite from Steinbach, Germa.ryt (Harvard University l'Ieteorite...indices ol refraction is still not 1 The Steinbach meteorite is a stony-iron (siderophyre) and has several |
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| at 220 °C of Orthorhombie High Tridymite from the Steinbach Meteorite BY W. A. DOLLASE* Massachusetts...A. (Received 15 February 1967) Tridymite from the Steinbach meteorite has been examined at 220°C and...is distorted in comparison with the ideal high-tridymite structure. The tetrahedra remain nearly regular...unusually large, amounting to 0.4 tl,. Introduction Tridymite, a polymorph of SiO2, is known from numerous sources...suggests the existence of several different types of tridymite. The (only) three meteoritic and (only) two silica |
 | Ulff-Møller, Finn, Rasmussen, Kaare L., Prinz, Martin, Palme, Herbert, Spettel, Bernhardt, Kallemeyn, Gregory W. (1995) Magmatic activity on the IVA parent body: Evidence from silicate-bearing iron meteorites. Geochimica et Cosmochimica Acta, 59 (22) 4713-4728 doi:10.1016/0016-7037(95)00318-5 | Journal (article/letter/editorial) |
| 3Max-Planck-Institut for Chemie, Saarstrasse 23, D-6500 Mainz, Germany aInstitute of Geophysics and Planetary Physics...r of the magmatic IVA iron meteorites contain tridymite or clinobronzite-orthobronzitetridymite which...to terrestrial boninites, at the protobronzite-tridymite cotectic in the olivine-plagioclase-silicasystem...the range 1400-1350°C was inferred for the Steinbach meteorite from the estimated distribution coefficient...Joao Nepomuceno and Steinbach, stony-irons dominated by low-Ca pyroxenes and tridymite, as well as Gibeon |
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| page 214–218, 2019 LETTER Raman spectra of tridymite modifications: MC, MX–1, and PO–10 Masami KANZAKI...Japan In order to facilitate identification of tridymite modifications using micro–Raman spectroscopy, the...the Raman spectra of synthetic and natural tridymite modifications (MC, MX–1, and PO–10) including low...below 150 cm−1. Using the compiled Raman spectra, tridymite modifications of the reported Raman spectra from...Keywords: SiO2, Tridymite modification, Raman spectroscopy, Phase identification, Meteorite INTRODUCTION |
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| Cambridge CB2 3EQ, U.K. AssrRAc'T Samplesof tridymite from the Steinbachmeteoritewereexaminedby ditrerentialscanning...phasesfrom the literature are reported in Table l. Tridymite from the Steinbachmeteorite is monoclinic Upon...cooling between room temperature and 700 'C, tridymite undergoesa series of displacive at room temperature...Baur (1976). According the thermal behavior of tridymite with a variety of tech- to Dollase (1967), this...calorim- to that reported for hexagonal high tridymite (HP), but etry, differential thermal analysis |
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| iron meteorites and two related stony irons, Steinbach and Sgo JoHo Nepomuceno. Analyses of bulk metal...IIIAB. Compositions of the metal fractions in Steinbach and SBo Jo&o Nepomuceno match the calculated solid...60 ~01% of a unique, coarse-grained mixture of tridymite, orthobronzite, and clinobronzite. Silicate-metal...al. ( 1995) to account for the fast cooling of Steinbach from 1200°C. 1. INTRODUCTION who found a wide...meteorites, Steinbach and Sgo Jolo Nepomuceno, which have abundant rounded pyroxene-tridymite inclusions |
 | Cellai, D., Carpenter, M.A., Kirkpatrick, R.J., Salje, E.K.H., Zhang, M. (1995) Thermally induced phase transitions in tridymite: an infrared spectroscopy study. Physics and Chemistry of Minerals, 22 (1) doi:10.1007/bf00202680 | Journal (article/letter/editorial) |
| 1995 Thermally Induced Phase Transitions in Tridymite: an Infrared Spectroscopy Study D. Cellai 1, M...infrared active modes of meteoritic and synthetic tridymite have been investigated between 23 K and 1073 K...emission experiments. At room temperature both tridymite samples consist of a mixture of low temperature...grinding. The sequence of phase transitions in Steinbach tridymite deduced from the IR data agrees well with...Changes in the infrared spectra of synthetic tridymite give a different sequence of phase transitions |
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| August 2019 Editor: R. Dasgupta Keywords: Steinbach meteorite Pb-Pb chronology Al-Mg isotopes accretion...Al-Mg ages for the Group IVA silicate-iron Steinbach meteorite. A Pb-Pb age based on multiple fractions...late-phase, slowly-cooled orthopyroxene from Steinbach yields an absolute age of 4565.47 ± 0.30 Ma corresponding...U-corrected Pb-Pb absolute age for a differentiated meteorite. We use the deficit Al-Mg dating method on one...Al relative to Mg in the source material for Steinbach. Assuming this fractionation event occurred in |
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| Mineralooist Vol. 57, pp. 1530-1535 O972\ LUNAR TRIDYMITE AND CRISTOBALITE Bnrex Mesolv, Sm,ithsoniam Institution...to Earth was the rather frequent occurrenceof tridymite and cristobalite as accessoryminerals. This feature...repeatedin the rocks from later missions.Typically the tridymite occurs as thin platy crystals (appearingas narrow...inversion frorn the high-temperature form. The tridymite also shows patchy extinction attributable to inversionfrom...Apollo 1-5 landing site, contains well-developed tridymite (0.7 percentby weight) and cristobalite (0.4 percent) |
 | HIROSE, Tadayuki, KIHARA, Kuniaki, OKUNO, Masayuki, FUJINAMI, Syuhei, SHINODA, Keiji (2005) X-ray, DTA and Raman studies of monoclinic tridymite and its higher temperature orthorhombic modification with varying temperature. Journal of Mineralogical and Petrological Sciences, 100 (2) 55-69 doi:10.2465/jmps.100.55 | Journal (article/letter/editorial) |
| 2005 X-ray, DTA and Raman studies of monoclinic tridymite and its higher temperature orthorhombic modification...profiles and DTA curves were measured on monoclinic tridymite from C, and their posifired silica brick. Ten...peratures studied. Keywords: Orthorhombic tridymite, Monoclinic tridymite, Phase transition, X−ray structure...INTRODUCTION Several meta−stable varieties of tridymite (SiO2) have been reported under ambient conditions;...(Hoffmann, 1967; Kato and Nukui, 1976) are MC. MC tridymite is also reported from fired silica bricks (Dollase |
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| at 220 °C of Orthorhombie High Tridymite from the Steinbach Meteorite BY W. A. DOLLASE* Massachusetts...A. (Received 15 February 1967) Tridymite from the Steinbach meteorite has been examined at 220°C and...is distorted in comparison with the ideal high-tridymite structure. The tetrahedra remain nearly regular...unusually large, amounting to 0.4 tl,. Introduction Tridymite, a polymorph of SiO2, is known from numerous sources...suggests the existence of several different types of tridymite. The (only) three meteoritic and (only) two silica |
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| unit-cell dimensions, and a hexagonal structure of tridymite Kuniaki Kihara Department of Earth Sciences, Faculty...Received: July 28, 1978 Abstract. Monoclinic tridymite from a fired silica brick was found to transform...intensities as functions of temperature. This tridymite changes its structure on increasing temperature;...- S i - 0 = 109.5°. Introduction Monoclinic tridymite is known to occur in terrestrial rocks, lunar...meteorites and synthetic materials. Tridymite from the Steinbach meteorite was found to be monoclinic at room |
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| Electron Diffraction Study of the Polymorphs of SiO2-Tridymite R.L. Withers 1 J.G. Thompson 1 y. Xiao 2, R.J...relationship to the extensive structural polymorphism of tridymite are presented. It is found that low energy modes...modes of distortion of the ideal tridymite tetrahedral framework structure give rise to a strong and extremely...for the two highest temperature polymorphs of tridymite. Experimental results strongly suggest that this...is rather an intrinsic property of the ideal tridymite tetrahedral framework structure. The diffuse intensity |
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| similarity between IVA irons and L/LL chondrites. Steinbach and São João Nepomuceno, containing inclusions...mass-dependent fractionation of 18O/16O between tridymite and bronzite with apparent oxygen isotopic heterogeneity...without detectable fractionation of 18O/16O between tridymite and quartz. Oxygen isotope equilibrium temperatures...for coexisting tridymite and bronzite in the same sample slabs or clusters in Steinbach and São João...fractionations of 18O/16O between bronzite and tridymite range from 1.6 to 2.3‰ in different sample slabs |
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| MINERALOGIST, VOL, 52, MARCH-APRIL, 1967 NEW DATA ON TRIDYMITE R.q.vx{oNrW. GnaNr, DepartmentoJ Geology,Uniaersity...chemical composition of natural tridymite is poorly known. Of the ten tridymite analysescited by Frondel (1962)...analysis of tridymite is given b1' Sato \1962). Chemical, x-ray, and optical data on tridymite from two...given in this paper. One specimenis of the meteorite from Steinbach, Germa.ryt (Harvard University l'Ieteorite...indices ol refraction is still not 1 The Steinbach meteorite is a stony-iron (siderophyre) and has several |
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| Mineralogist, Volume 58,pages 717-720, 1973 WoodOpal-A Tridymite{ikeMineral Rrcnano S. MrrcHerr,. ANDSuseNTurrsl...wood usually has a structure approaching high-tridymite. Only in rare cases does it resemble low-cristobalite...Spectrochemical studies show that the silica of tridymite-like opals is chemically more pure than the silica...localities,have shown that this material usually has a tridymite-like structure, a somewhatdisordered structure...Virginia showingthis structure,the occurrence of tridymite in such material was believed to be very rare |
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| occurrences a rapid crystallization or cooling of the meteorite substance is strongly indicated. Like the glass...usually left as a residue on treatment of the meteorite with acid. This residue sometimes amounts to from...or dust left as a residue after dissolving the meteorite in acid. The particles mm in diameter. They are...sulphide. Tridymite.-This mineral has been positively identified in only one meteorite (Steinbach), but it...These are all ironstone meteorites. In the Steinbach meteorite it forms from 8.5 to 33 per cent. of the |
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| Study of the Thermal Behavior of Terrestrial Tridymite by Continuous X-Ray Diffraction Eugene A. Smelik*...transition behavior of two types of ter- restrial tridymite; crystals from Topaz Mountain in the Thomas Range...a = 17.072 ~, b=9.923 ~, and c=16.291 ~. The tridymite is designated PO-2 (nomenclature of Nukui and...involved gradual structural distortions of the tridymite framework that occurred over discrete ranges of...Introduction The metastable transition behavior of tridymite has been the subject of much study during the |
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| Zeitschrift für Structural change of orthorhombic-/ tridymite with temperature: A study based on second-order...April 7, 1986; in revised form July 6, 1986 Tridymite / Structure transition / Disorder Abstract. X-ray...X-ray studies of orthorhombic-/ tridymite, especially focussed on atomic mean-square displacements (m...Kihara, T. Matsumoto and M. Imamura Introduction Tridymite is a unique mineral, which shows successive structure...transitions at atmospheric pressure. Monoclinic tridymite, from silica brick, at room temperature shows |
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| Saxon frontier or indeed from Eittersgriin, in Saxony, where a mass closely resembling it was almost...1751 at Steinbach, a village about midway between Breitenbach and Eittersgriin, a meteorite in all respects..."Eisenregen" which occurred at Whitsuntide, 11G4, in Saxony, when a mass of iron fell near the town of Meissen...by Eumler in the case of the silicates of the Steinbach siderolite. The composition of the bronzite, as...iron met with in the bronzite of the Manegaum meteorite (page 403), which stone contains next to no nickel-iron |
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| IVA meteorite parent body: Clues from pyroxene geochemistry in the Steinbach stony-iron meteorite Alex...Alex RUZICKA* and Melinda HUTSON Cascadia Meteorite Laboratory, Department of Geology, Portland State University...October 2006) Abstract–We analyzed the Steinbach IVA stony-iron meteorite using scanning electron microscopy...crystallized over an extensive fractionation interval. Steinbach probably formed as a cumulate produced by extensive...disruption appears best able to explain the data for Steinbach and other IVA meteorites. Impact disruption occurred |
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| crystals from two group IVA stony iron meteorites—Steinbach (ST) and São João Nepomuceno (SJN)— on the basis...studies of the disordered clinobronzite in the ST meteorite by using electron diffraction and high-resolution...slower cooling, ⬍300°C/y, in 1. INTRODUCTION Steinbach (ST) and São João Nepomuceno (SJN) are stony...of silicates made of coarse-grained mixture of tridymite, orthopyroxene and clinopyroxene. Scott et al...from a single slowly cooled fragment requiring a meteorite yield factor equivalent to that of a randomly |
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| Heat capacities and inversionsin tridymite, cristobalite, and tridymite-cristobalite mixed phases ALAN...Samplesof synthetictridymite, cristobaliteand tridymite-cristobalitemixed phases,examined by differential...showeddistinct peaks in heat capacity (Cp). For "pure" tridymite the lambda transition at 390K and two peaksnear...Glasser(1970)for tridymite, although the feature observedin both these studiesat 498K wasabsentin our tridymite sample...the "tridymite" samplesused in the previous studies,as suggestedby our DSC examination of tridymite-cristobalite |
