Solid solutions in mineral nomenclature     

E. H. Nickel 《Mineralogy and Petrology》1992,46(1):49-53

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3. Einregelung naeh dem Periklingesetz „mit verminderter Symmetrie”.     

Erwin Nickel 《Contributions to Mineralogy and Petrology》1947,1(1):117-120

Zusammenfassung Das Periklingesetz verlangt Spiegelsymmetrie in der Zone senkrecht [010]; die kristallographische Symmetrie wiederholt sich in der Lage der Indikatrizen. Die Einmessung zeigt aber, daß (trotz normaler Verwachsung nach dem rhombischen Schnitt) die Symmetrie der verzwillingten Indikatrizen verringert ist: die (theoretische)ZE fungiert nur als Halbierungsebene der korrespondierten Mittellinien, die volle Symmetrie wird nicht verwirklicht. In unserem Falle ist die eingelagerte Zwillingspartie in bezug auf dieZE korrekter orientiert als das Hauptindividuum. - Die Konstruktion derZE nachBEREK führt auch bei der verminderten Symmetrie der verzwillingten Indikatrizen zur Auffindung der morphologisch definierten Zwillingsachse. -Man wird eben nicht vergessen dürfen, daß die Zwillingsgesetze Idealformulierungen sind, denen die Wirklichkeit nicht immer gerecht wird.  相似文献   

Magma mixing as the probable origin of some Permian volcanic rocks of the Saar-Nahe-Basin (SW-Germany)     

Klaus G. Nickel 《International Journal of Earth Sciences》1981,70(3):1164-1176

Some Permian calc-alkaline rocks of the Saar-Nahe-Basin are briefly described and their origin is discussed in the light of a magma-mixing model for the intermediate members. The model is based on high trace element concentrations of Ni, Cr, Rb, Sr, Zr and Nb, straight-line chemical variations, mineralogical features and stratigraphie sequence of the volcanic rocks. The model is in accord with a geodynamic model for the Hercynian belt as suggested by Lorenz & Nicholls (in prep.).  相似文献   

The IMA Commission on New Minerals and Mineral Names: procedures and guidelines on mineral nomenclature, 1998     

Vice-Chairman E. H. Nickel  Chairman J. D. Grice 《Mineralogy and Petrology》1998,64(1-4):237-263

Summary An author wishing to introduce a new mineral name into the literature, or to redefine, discredit or rename an existing mineral, must obtain prior approval of the IMA Commission on New Minerals and Mineral Names. This paper outlines the procedure to be followed in the preparation and submission of a proposal for approval, and describes how such proposals are handled by the Commission. The paper also gives general guidelines on mineral nomenclature and provides a list of nomenclature changes approved since 1987.

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Zusammenfassung Autoren, die einen neuen Mineralnamen in die Literatur einführen, oder einen solchen neu definieren, abschaffen oder ein schon bekanntes Mineral mit einem neuen Namen belegen wollen, müssen dafür vorher die Zustimmung der IMA Commission of New Minerals and Mineral Names einholen. In dieser Arbeit wird die empfohlene Vorgangsweise für die Vorbereitung und Einreichung eines Antrages dargestellt. Ebenso wird die Vorgangsweise der Kommission, die sich mit solchen Anträgen befaßt, in Übersicht gebracht. Weiters geben wir allgemeine Hinweise zur Nomenklatur von Mineralen und geben eine Liste von Nomenklatur-Änderungen vor, die seit 1987 genehmigt worden ist.

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Sedimentology—Process and product: M.R. Leeder. Allen and Unwin,London, 1982, xv + 384 pp., hardback £stg 25.00/US $50.00, paperback £stg 11.95/US $24.95     

E. Nickel 《Sedimentary Geology》1983,34(4):339-340

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The silver-arsenide deposits of the Cobalt-Gowganda region,Ontario, The Canadian mineralogist: L. G. Berry (editor), Vol. 11, Pt. 1, 1971. 429 pp., 227 Figs. $10.0     

E.H. Nickel 《Geochimica et cosmochimica acta》1973,37(3):713-714

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Geochemistry of oilfield waters (developments in petroleum science, 1): A. Gene Collins. Elsevier,Amsterdam, 1975, 496 pp. Dfl. 95.00     

E. Nickel 《Sedimentary Geology》1975,14(4):321-322

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Standardisation of polytype suffixes     

H. H. Nickel 《Mineralogy and Petrology》1994,50(4):293-294

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Orthopyroxene-clinopyroxene equilibria in the system CaO-MgO-Al2O3-SiO2 (CMAS): new experimental results and implications for two-pyroxene thermometry     

K. G. Nickel  G. P. Brey  L. Kogarko 《Contributions to Mineralogy and Petrology》1985,91(1):44-53

A new set of reversal experiments for coexisting ortho- and clinopyroxenes in the system CMAS at conditions between 1,000–1,570° C and 30 to 50 kb is presented and combined with literature data. Pyroxene behaviour, particularly that of clinopyroxene, is very complicated and different styles of Al incorporation into the pyroxene structure for low and high concentrations of Al are indicated, strongly influencing the exchange of the enstatite component between ortho- and clinopyroxene. Thermodynamic modelling of this exchange is problematic because of the large number of unknown coefficients compared to the number of experiments. Thermometry based on such models becomes very dependent on accuracy of experimental data and analyses of small quantities of elements. Despite this complexity very simple empirical thermometric equations are capable of reproducing experimental conditions in the systems CMS and CMAS over a wide range of P, T conditions. We derived the equation which gives a mean error of estimate of 25° C when applied to CMS and CMAS data.Abbreviations Used in the Text cpx clinopyroxene - di diopside, CaMgSi₂O₆ - en enstatite, Mg₂Si₂O₆ - opx orthopyroxene - px Pyroxene - py pyrope - a _i ^j activity of component i in phase j - activity coefficient - G _P,T (A) molar Gibbs free energy difference of reaction (A) at P, T - X _i ^j mole fraction of component i in phase j  相似文献   

Unusual nickel mineralisation at Nullagine,Western Australia     

E. H. Nickel  J. A. Hallberg  R. Halligan 《Australian Journal of Earth Sciences》2013,60(1-2):61-71

Nickel mineralisation occurs in shears in Archaean serpentinised peridotite near Nullagine, Western Australia. The principal nickel minerals are millerite, polydymite and pecoraite, which occur chiefly as concentrations of nodular grains, mostly between 1 and 5 mm in diameter. The polydymite represents a replacement of millerite, and is in turn partly replaced by gaspéite. The pecoraite grains generally contain several percent chromium, and are frequently rimmed by millerite‐containing magnetite. A similar type of nodule consists of nullaginite (Ni₂(OH)₂CO₃). Other major minerals in the shears include various types of serpentine and magnesite, coarse chlorite, and apatite. The assemblage is cut by late veinlets of gaspéite, pecoraite, otwayite (Ni₂(OH)₂CO₃.H₂O), and nullaginite. Trace amounts of barite, cinnabar, parkerite, shandite, breithauptite, and nickeloan greenockite are also present.

The bulk of the mineralisation is attributed to the effects of hydrothermal and/or metasomatic activity along shears in the serpentine. Concretionary magnesite in some of the shears is believed to be the result of Tertiary weathering. The late veinlets of nickel minerals and the replacement of millerite and polydymite are attributed to supergene effects.  相似文献