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Johnstown Meteorite

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Journal Article
Published: 01 January 2000
European Journal of Mineralogy (2000) 12 (1): 163–176.
...Rolf HEINEMANN; Herbert KROLL; Falko LAGENHORST; Tore LUEDER Abstract The partitioning of Fe 2+ and Mg on the M1 and M2 sites of orthopyroxenes from the Johnstown meteoritic diogenite has been equilibrated between 1000°C and 700°C in ordering and disordering runs. The method of bivariate high order...
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Journal Article
Published: 01 August 2008
European Journal of Mineralogy (2008) 20 (4): 551–561.
...Rolf Heinemann; Herbert Kroll; Falko Langenhorst Abstract The Fe 2+ , Mg order/disorder process in orthopyroxenes from the Johnstown meteoritic diogenite is extremely slow. It is controlled by an activation energy of ≈ 100 kcal/mol, whereas in other orthopyroxenes with similar compositions...
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Journal Article
Published: 01 March 2003
European Journal of Mineralogy (2003) 15 (2): 373–380.
... the Johnstown meteorite. The kinetics of cation disordering in orthopyroxene has been studied by Mössbauer spectroscopy ( Virgo & Hafner, 1969 ; Besancon, 1981 ; Anovitz et al. , 1988 ) and by single-crystal X-ray diffraction ( Saxena et al. , 1987 , 1989; Skogby, 1992 ; Sykes-Nord & Molin...
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Journal Article
Published: 01 July 2000
European Journal of Mineralogy (2000) 12 (4): 735–748.
... et al. (1997) (∼ 63 kcal/mol). Physically unreasonable cooling rates for meteoritic bodies are extracted from the kinetic constants obtained from those experiments. All conflicting results were obtained on orthopyroxene crystals of the Johnstown meteorite. Orthopyroxene from this meteorite has...
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Journal Article
Published: 01 October 2014
American Mineralogist (2014) 99 (10): 2043–2048.
... and temperature variation of the intracrystalline Fe 2+ , Mg fractionation in Johnstown meteoritic orthopyroxene . European Journal of Mineralogy , 12 , 163 – 176 . Heinemann R. Kroll H. Langenhorst F. ( 2008 ) Relationship between Guinier-Preston zones and the kinetics...
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Journal Article
Published: 01 June 1976
American Mineralogist (1976) 61 (5-6): 373–378.
...R. Gooley; C. B. Moore Abstract Metal particles in eight of the nine known diogenites have been analyzed for Fe, Co, and Ni by electron microprobe. Those in Shalka, Tatahouine, Garland, and the majority in Ellemeet contain less than 1.5 weight percent Ni. The metal in Johnstown ranges from 2.5...
Journal Article
Published: 01 July 2002
American Mineralogist (2002) 87 (7): 838–844.
... of the intracrystalline Fe 2+ , Mg fractionation in Johnstown meteoritic orthopyroxene . European Journal of Mineralogy , 12 , 163 – 176 . Kroll , H. , Lueder , T. , Schlenz , H. , Kirfel , A. , and Vad , T. ( 1997 ) The Fe 2+ , Mg distribution in orthopyroxene: a critical assessment of its...
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Journal Article
Published: 01 July 2001
European Journal of Mineralogy (2001) 13 (4): 715–726.
... predict frozen states of order from independently determined functions K D (T) and k dis (T), thereby supporting results obtained by Heinemann et al. (2000) on orthopyroxenes from the Johnstown meteorite. Fig. 6. Ordering path of bronzite crystal BNZ2ST-2: variation of X̄ Fe M2 with time...
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Journal Article
Published: 01 January 2005
American Mineralogist (2005) 90 (1): 155–161.
... and temperature variation of the intracrystalline Fe 2+ , Mg fractionation in Johnstown meteoritic orthopyroxene . European Journal of Mineralogy , 12 , 163 – 176 . Kroll , H. , Lueder , T. , Schlenz , H. , Kirfel , A. , and Vad , T. ( 1997 ) The Fe 2+ , Mg distribution...
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Journal Article
Published: 01 November 2005
American Mineralogist (2005) 90 (11-12): 1816–1823.
... and temperature variation of the intracrystalline Fe 2+ , Mg fractionation in Johnstown meteoritic orthopyroxene . European Journal of Mineralogy , 12 , 163 – 176 . Ibers , J.A. and Hamilton , W.C. , Eds. ( 1974 ) International Tables for X-ray Crystallography , vol. 4 , pp. 99 – 101...
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Journal Article
Published: 01 January 2009
American Mineralogist (2009) 94 (1): 176–180.
...) . § Supplied by Ian Steele, University of Chicago. Asbestos microcline† K 2 O (all phases) Black Rock Summit chromium augite‡ SiO 2 (cpx), Al 2 O 3 (ol, cpx, opx), FeO* (cpx), MgO (cpx), Ca (ol, cpx, opx, spn) Corundum Al 2 O 3 (spn) Johnstown Meteorite hypersthene SiO 2 (opx), FeO...
Journal Article
Published: 01 July 2000
American Mineralogist (2000) 85 (7-8): 953–962.
... . European Journal of Mineralogy , 3 , 863 – 875 . Molin , G.M. , Saxena , S.K. , and Brizi , E. ( 1991 ) Iron-magnesium order-disorder in an orthopyroxene crystal from the Johnstown meteorite . Earth and Planetary Science Letters , 105 , 260 – 265 . Morimoto , N...
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Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2203–2210.
... of the intracrystalline Fe 2+ , Mg fractionation in Johnstown meteoritic orthopyroxene . European Journal of Mineralogy , 12 , 163 – 176 . Irvine T.N. ( 1965 ) Chromian spinel as a petrogenetic indicator . Canadian Journal of Earth Sciences , 2 , 648 – 672 . Lavina B. Salviulo G. Della...
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Journal Article
Published: 01 August 2002
American Mineralogist (2002) 87 (8-9): 1250–1256.
... in orthopyroxenes, locally in symplectic association with chromites, or associated with metal, have been characterized for the first time in a diogenite. Mosaicism of the orthopyroxenes indicates shock effects in the meteorite. The shock history of the meteorite must be consistent with the presence of vein-like...
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Journal Article
Published: 01 August 2013
American Mineralogist (2013) 98 (8-9): 1526–1534.
... R. Kroll H. Langenhorst F. ( 2008 ) Relationship between Guinier-Preston zones and the kinetics of the intracrystalline Fe 2+ , Mg exchange reaction in Johnstown meteoritic orthopyroxene . European Journal of Mineralogy , 20 , 551 – 561 . Ibers J.A. Hamilton W.C. ( 1974...
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Journal Article
Published: 01 April 2008
Earth Sciences History (2008) 27 (1): 136–150.
... descriptions it provides, but the many geological gems that are found within will keep the interest of any earth scientist. The translators have brought the English reader a really good story—that happens to be true. William R. Brice, Geology & Planetary Science, University of Pittsburgh at Johnstown...
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Journal Article
Published: 01 October 2001
Earth Sciences History (2001) 20 (2): 196–228.
... and humorous, making this story easy to digest, a “page-turner” as one colleague called it. This combination should make Kalb’s book a great read for scientists and layman alike. Most of the information in the catalogue is gleaned from The Meteoritical Bulletin , which is the internationally recognized...
Journal Article
Published: 01 January 2002
Reviews in Mineralogy and Geochemistry (2002) 50 (1): 77–120.
... reduced pyroxenite) and three HED meteorites (Johnstown, Pasamonte, and Sioux County). Of the HED meteorites, Johnstown is diogenite (orthopyroxenite), whereas Pasamonte, and Sioux County are unequilibrated and equilibrated eucrites (basalts), respectively. The two pyroxenites have low Be (6–13 ppb...
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Journal Article
Published: 01 October 2000
American Mineralogist (2000) 85 (10): 1375–1382.
... crystal from the Johnstown meteorite . Earth and Planetary Science of Letters , 105 , 260 – 265 . North , A.C.T. , Phillips , D.C. , and Mathews , F.S. ( 1968 ) A semi-empirical method of absorption correction . Acta Crystallographica , A24 , 351 – 359 . Papike , J.J...
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Journal Article
Published: 01 April 2021
Geochemical Perspectives (2021) 10 (1): 31–40.
.... A study of the transformation of rock masses . Methuen, London . Heinemann , R. , Kroll , H. , Langenhorst , F. , Leuder , T. ( 2000 ) Time and temperature variation of the intracrystalline Fe 2+ , Mg fractionation in Johnstown meteoritic orthopyroxene . European Journal...
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