 | | Journal (article/letter/editorial) | | artinite, brugnatellite, coalingite), followed by aragonite, brucite, dolomite and calcite. Two main stages...minerals of fissures are calcite, dolomite and aragonite. Mineral assemblages have formed from low-temperature...Introduction In the last years the active serpentinite quarry near Hrubšice in Moravia provide an opportunity...with brucite, hydromagnesite, pyroaurite and aragonite, localy with dypingite, magnesite and serpentine...studied mineralization was found in the open wall quarry „U Pustého mlýna“ (Kamena Brno company) which is |  | Altherr, Rainer, Soder, Christian, Panienka, Sandra, Peters, Daniel, Meyer, Hans-Peter (2013) Pink manganian phengite in a high P/T meta-conglomerate from northern Syros (Cyclades, Greece) Contributions to Mineralogy and Petrology, 166 (5) 1323-1334 doi:10.1007/s00410-013-0929-7 | Journal (article/letter/editorial) | | sub-assemblage braunite ? quartz ? calcite (former aragonite) suggests high oxygen fugacities relative to the...Im Neuenheimer Feld 234-236, 69120 Heidelberg, Germany e-mail: rainer.altherr@geow.uni-heidelberg.de ...at Terrachem Analytical Laboratory (Mannheim, Germany) using a Bruker AXS S8 TIGER spectrometer. Precision...aegirine–jadeite ? braunite ? hollandite ? hematite ? aragonite (now transformed to calcite) ? microcline ± albite...nearly free of Ca and K (Table 1). Calcite (former aragonite) proved to have low contents of MnO (B0.22 wt%) |  | | Journal (article/letter/editorial) | | two previous CORALS conferences, held in Mainz, Germany (2009), and Madrid, Spain (2011), the CORALS–2013...Freiberg, Brennhausgasse 14, 09596 Freiberg/Sa., Germany e-mail: goetze@mineral.tu-freiberg.de J. M. Hanchar...Mn-bearing carbonates. The different CL colours of aragonite (green) and calcite (orange-red) are explained...shift of the main Mn2+ emission band. Courtesy C. Lenz. f Three-dimensional TL spectrum of quartz from...pressure – high temperature treatment. The article by Lenz et al. focuses on effects of the crystal field on |  | | Journal (issue) | | 2005 President’s Message February 2005 by Norman Lenz President, Years 2004-2005 F ellow HGMS Rock Kickers...February General Meetings. In January, Norm and Susan Lenz will give us a guided tour of Alaska with a presentation...their experience with us. You’ll see glaciers from land, sea, and air, and two different gold mining operations...these came from Art Smith, Scott Singleton, and Norm Lenz. It’s wonderful to work with such committed people...T he following Board members were present: Norm Lenz, President; Scott Singleton, First Vice President; |  | | Journal (issue) | | ...................................... 16 Susan Lenz Update ...........................................changed) pyrite/marcasite; brookite/rutile; calcite/aragonite; etc. Epimorph or Perimorph One mineral coats...Formula Aegirine ĺ Quartz Aragonite ĺ Quartz NaFeSi2O6 ĺ SiO2 CaCO3 ĺ SiO2 Aragonite ĺ Opal CaCO3 ĺ SiO2xxH2O...Fluorite ĺ Quartz Gypsum ĺ Quartz Barite ĺ Sulfur Aragonite ĺ Copper Azurite ĺ Copper CaSO4x2H2O ĺ SiO2 BaSO4...Gypsum ĺ Celestite Glauberite ĺ Gypsum Aragonite ĺ Dolomite Aragonite ĺ Rhodochrosite Dolomite ĺ Smithsonite |  | | Journal (article/letter/editorial) | | formation of vaterite and inhibiting that of aragonite. Se(VI) also affects the characteristics of calcite...contents up to 1200 ppm, vaterite up to 500 ppm, and aragonite growing virtually Se-free. The role of Se(VI)...identified as a major contaminant in aquatic ecosystems (Lenz and Lens 2008; May et al. 2008). This element is...in the gel column. CaCO3 polymorphs: calcite, aragonite, and vaterite. The different phases were initially...calcite was found in region 3 in any experiment. Aragonite crystals were only detected in region 1. The influence |  | | Journal (issue) | | Outgoing President’s Message December, 2005 by Norman Lenz HGMS President, 2004-2005 ellow HGMS Members, ...Quartz, recotrite, and cookite from the Jeffrey quarry near Little Rock Arkansas. Arkansas Geological...microscopic quartz crystals Group Jones Mill quarry, M.C. Jones Mill quarry, M.C. Anatase deep blue crystals on...quartz leucoxene, minute white crystals Jones Mill quarry, M.C. Brookite deposits, Magnet Cove Ankerite discoids...brown, small Jeffrey quarry, Pulaski Co. Antimony mines, Sevier County Aragonite snowy white coatings |  | | Journal (article/letter/editorial) | | habit which is interpreted as pseudomorphic after aragonite; optically the carbonate is biaxial while X-ray... 8. Aragonite was not found on Ios but as discussed above, some is pseudomorphic after aragonite. The...the experimentally determined curve (2) of the aragonite-calcite transition (Jo~IANNES and PUHAN, 1971)...quartz = albite (BoETTCHER and WYLLIE, 1969); 2, aragonite = calcite (JohANNES and PVHAN, 1971); 8, crossite...the following minerals and mineral assemblages. Aragonite has been replaced by calcite and sodie pyroxene |  | | Journal (article/letter/editorial) | | Oxygen isotope fractionation between synthetic aragonite and water: Influence of temperature and Mg2+ concentration...April 2007; available online 3 May 2007 Abstract Aragonite was precipitated in the laboratory at 0, 5, 10...equilibrium oxygen isotope fractionation between aragonite and water. Forced CO2 degassing, passive CO2 degassing...employed to precipitate aragonite from supersaturated solutions, but the resulting aragonite–water oxygen isotope...rate on the oxygen isotope fractionation between aragonite and water was almost within the analytical error |  | | Journal (article/letter/editorial) | | Journal Pre-proofs On the coordination of Mg2+ in aragonite: Ab-initio absorption spectroscopy and isotope..., Kwon, K.D., On the coordination of Mg2+ in aragonite: Abinitio absorption spectroscopy and isotope...rights reserved. On the coordination of Mg2+ in aragonite: Ab-initio absorption spectroscopy and isotope...Cosmochimica Acta 1 Abstract Magnesium in biogenic aragonite skeletons is widely used to infer the geochemical... because molecular speciation of Mg2+ in the aragonite crystal structure remains uncertain, questions |  | | Journal (issue) | | Behnke Northbrook, IL Werner Lieber Heidelberg, W. Germany Eric Offermann Arlesheim, Switzerland Jeffrey A... 123 by M. Amabili, A. Miglioli & F Spertini Aragonite from Cicov Hill in the Czech Republic ..........Burchard Schlossstr. 6 D-85354 Haindlfing, Freising Germany email: ulrich. burchard@t-online.de After nearly...Frankenheim (1801-1869), a physicist from Breslau, Germany. Frankenheim extensively studied the hardnesses...discoveries have recently been made at the well-known aragonite occurrence at Cicov Hill, near Horenec, near Bilina |  | Arp, Gernot, Kolepka, Claudia, Simon, Klaus, Karius, Volker, Nolte, Nicole, Hansen, Bent T. (2013) New evidence for persistent impact-generated hydrothermal activity in the Miocene Ries impact structure, Germany. Meteoritics & Planetary Science, 48 (12) 2491-2516 doi:10.1111/maps.12235 | Journal (article/letter/editorial) | | activity in the Miocene Ries impact structure, Germany Gernot ARP*, Claudia KOLEPKA, Klaus SIMON, Volker...Zentrum, Goldschmidtstrasse 3, D-37077 G€ ottingen, Germany * Corresponding author. E-mail: garp@gwdg.de (Received...crater N€ ordlinger Ries is located in southern Germany, 110 km NW of Munich. Its circular morphological...microscope (Carl Zeiss MicroImaging GmbH, Jena, Germany), using 13 large thin sections (7 9 10 cm, 80 lm...red S to distinguish dolomite from calcite and aragonite (Friedman 1959). The mineralogical composition |  | | Journal (article/letter/editorial) | | Cambridge Regional Guide to the Earth Stratigraphy Lenz . . . . . . . . . . . . 003%0738/89/$03.50 by David...the study of C and O isotopes in calcite and aragonite P.C. Smalley, D.E. Stijfhoorn, A. R&heim, H. Johansen |  | | Journal (issue) | | 2005 President’s Message April, 2005 by Norman Lenz HGMS President, 2004-2005 ellow HGMS Club Members...carbide from Niagara Falls, bismuth crystals from Germany, zincite crystals from Poland, Some Italian sulfur...(CaMgCO3), which is harder than the calcite and aragonite (CaCO3) materials that are typical of other marine...receive a digital copy by e-mailing either Norm Lenz (lenz@houston.rr.com) or me (ssingle@airmail.net)....serious roof leak there, but another angel, Norm Lenz, got the roof fixed. Then, too, it would have taken |  | Lécuyer, Christophe, Hutzler, Aurore, Amiot, Romain, Daux, Valérie, Grosheny, Danièle, Otero, Olga, Martineau, François, Fourel, François, Balter, Vincent, Reynard, Bruno (2012) Carbon and oxygen isotope fractionations between aragonite and calcite of shells from modern molluscs. Chemical Geology, 332. 92-101 doi:10.1016/j.chemgeo.2012.08.034 | Journal (article/letter/editorial) | | Carbon and oxygen isotope fractionations between aragonite and calcite of shells from modern molluscs Christophe...18 September 2012 Editor: U. Brand Keywords: Aragonite Calcite Mollusc Stable isotope Isotopic fractionation...oxygen isotope fractionations between calcite and aragonite were investigated by analyzing marine gastropods...tropical climates. Species that secrete both aragonite and calcite layers were studied to ensure similitude...and in metabolic activity during shell growth. Aragonite and calcite layers from the adult parts of the |  | | Journal (article/letter/editorial) | | CO2 produced by acid digestion 6 of fish otolith aragonite is a function of growth temperature, following...composition of water is unknown. Natural coral aragonite precipitated at known temperatures generally conforms...Table 1 Stable isotopic composition of otolith aragonite with growth temperature and isotopic composition...al. (1997), Høie et al. (2004) and equilibrium aragonite precipitation line established based on Kim and...species Grossman and Ku (1986). calcite and aragonite in the isotopic fractionation that accompanies |  | | Journal (issue) | | ...................................... 25 Susan Lenz Update ...........................................area of New York, USA. Austria, Switzerland, and Germany have produced many fine specimens. There are hundreds...quartz variety include Val D’ Aoste, Italy and Germany. Wonderful milky “skeletal” iron-stained quartz...Victor. 1922. Atlas der Kristallformen. Heidelberg, Germany. Republished with high quality scans in DVD/PDF...Similar things are more than 10 times the price in Germany. They are just recently starting to sign their |  | | Journal (article/letter/editorial) | | com/locate/gca Oxygen isotope fractionation between aragonite and seawater: Developing a novel kinetic oxygen...Oxygen isotope fractionation factors between aragonite and seawater are studied at T = 25–55 °C and pH..., during spontaneous precipitation) and slow aragonite precipitation processes (e.g., during slow ‘free-drift’...between DIC species and aragonite during their attachment and detachment on aragonite surfaces at low temperatures...temperatures and the d18O value of aragonite equals the average d18O value of all contributing DIC species |  | Dellinger, Mathieu, West, A. Joshua, Paris, Guillaume, Adkins, Jess F., Pogge von Strandmann, Philip A.E., Ullmann, Clemens V., Eagle, Robert A., Freitas, Pedro, Bagard, Marie-Laure, Ries, Justin B., Corsetti, Frank A., Perez-Huerta, Alberto, Kampf, Anthony R. (2018) The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms. Geochimica et Cosmochimica Acta, 236. 315-335 doi:10.1016/j.gca.2018.03.014 | Journal (article/letter/editorial) | | measured samples include (i) modern calcite and aragonite shells from variable species and natural environments...significantly lower δ7Li compared to inorganic aragonite, indicating the existence of vital effects. Bivalves...Li incorporation into inorganic carbonates. In aragonite, Li+ is thought to substitute for Ca2+ in the...but not for aragonite (Marriott et al., 2004b) but the Li/Ca ratio of inorganic aragonite increases with...with the fractionation factor between inorganic aragonite and seawater, αaragoniteseawater = 0.988 to 0 |  | Eaton-Magaña, Sally, Breeding, Christopher M., Palke, Aaron C., Homkrajae, Artitaya, Sun, Ziyin, McElhenny, Garrett (2021) Raman and Photoluminescence Mapping of Gem Materials. Minerals, 11 (2) 177 doi:10.3390/min11020177 | Journal (article/letter/editorial) | | identify different CaCO3 polymorphs, including aragonite, tive technique that mainly used to identify different...59–61]. Aragonite is the most common CaCO3 polymorph found in nacreous pearls of both Aragonite is the...in in the center andyoung layersepithelium of aragonite deposition the outsideof[66]. Vaterite thelayers...layers calcite inCaCO the center and layersthat of aragonite deposition atin thethe outside Vateritefor 3 polymorph...of growth under FW environment. In addition, aragonite and calcite spectra were also found in nearby |  | | Journal (article/letter/editorial) | | yellow-green intensity and manganese content in aragonite. It is suggested that orange luminescence, observed...coordination of Mn2+ in vaterite as compared to aragonite. Zircon is another important mineral geologically...8, 556. [CrossRef] Bui Thi Sinh, V.; Osanai, Y.; Lenz, C.; Nakano, N.; Adachi, T.; Belousova, E.; Kitano |  | | Book | | Netherlands. Back cover The museum ldar-Oberstein. West-Germany. is quaintly situated beneath the Felsenkirche...Copyright 1986 by . Ulrich Burchard, Lalling, West-Germany All rights reserved including the right of reproduction...Printed in Germany Miscellaneous: Design & Lay Out by Rainer Bode, Haltern, West-Germany Type set by...Wurzburg, West-Germany Colour separations by Litho Thungen GmbH, Thungen, West-Germany H. Bari, Musee...Printed by Sellier Druck GmbH, Freising, West-Germany 6 Gasull, Museo de Geologia, Barcelona 249; V |  | Voarintsoa, Ny Riavo G., Barkan, Eugeni, Bergel, Shelly, Vieten, Rolf, Affek, Hagit P. (2020) Triple oxygen isotope fractionation between CaCO3 and H2O in inorganically precipitated calcite and aragonite. Chemical Geology, 539. 119500 doi:10.1016/j.chemgeo.2020.119500 | Journal (article/letter/editorial) | | H2O in inorganically precipitated calcite and aragonite Ny Riavo G. Voarintsoa, Eugeni Barkan, Shelly...H2O in inorganically precipitated calcite and aragonite, Chemical Geology (2018), https://doi.org/10.1016/j...H2O in inorganically precipitated calcite and aragonite Ny Riavo G. Voarintsoa1,a, Eugeni Barkan1, Shelly...slope, (ln17/ln18), is similar in calcite and aragonite The fractionation slope is independent of temperature...precipitate CaCO3 polymorphs, either calcite or aragonite, re at temperatures between 10 and 35°C. We |  | Shirai, Kotaro, Otake, Tsuguo, Amano, Yosuke, Kuroki, Mari, Ushikubo, Takayuki, Kita, Noriko T., Murayama, Masafumi, Tsukamoto, Katsumi, Valley, John W. (2018) Temperature and depth distribution of Japanese eel eggs estimated using otolith oxygen stable isotopes. Geochimica et Cosmochimica Acta, 236. 373-383 doi:10.1016/j.gca.2018.03.006 | Journal (article/letter/editorial) | | oxygen stable isotope ratios (δ 18 O) in otolith aragonite have been shown to be at or near isotopic equilibrium...Valley and Kita, 2009), but analysis of biogenic aragonite introduces the possibility of a systematic offset...analysis, there were no reliable standards for aragonite or for biogenic carbonates that contain eve n...effect (instrument bias) of up to 2‰ for biogenic aragonite causing low 18 O values (Orland et al., 2015;...mark, corresponding to the precipitation rate of aragonite during the 30-day rearing period, were found in |  | | Journal (article/letter/editorial) | | reaction (Fyfe et al., 1958, pp. 84-5) and the aragonite ---,calcite transformation (Brown et al., 1962)...rate-controlling step is shown by a study of the aragonite to calcite transformation under both wet and dry...~ TEMPERATURE 2o 60 loo 18 ' ' 160 ~ ARAGONITE ->-- CALCITE 12 10% Conversion (oc) 25o 3oo...(K) FIG. 1. A comparison of the rates of the aragonite calcite reaction under wet and dry conditions...under dry conditions (Fyfe et al., 1958, pp. 84-5; Lenz et al., 1977; Brady, 1983). Kridelbaugh (1973) found |
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