摘要:

ABSTRACTIn April, 1810, a large mass of nickel and iron was found by Cecilia Corredor, on Tocavita Hill, not quite a mile from the main square of the town of Santa Rosa de Viterbo, Department of Boyacá, Republic of Colombia. It was recognized as a meteorite by two fellow travelers, Mariano de Rivero and Jean Baptiste Boussingault, in 1823, who found it in the local smithy, where it was doing duty as an anvil. The history of this and another inseparable meteorite, known as Rasgatá, is outlined from that time up to the present, and some suggestions are made to eliminate the confusion that has prevailed regarding these two meteorites. Finally, two large specimens of meteorites found recently near Santa Rosa de Viterbo are describe

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00073.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

ABSTRACTThis paper presents a preliminary report on the friable enstatite achondrite, with nickel‐iron inclusions, more than a ton of which fell in Norton County, Kansas, and Furnas County, Nebraska, on 1948 February 18 (C.N. = 1000,400). Megascopically, the achondrite resembles a rhyolite porphyry, the fine‐grained groundmass of grayish‐white color containing phenocrysts of 2 types, the first, a light‐gray mineral exhibiting cleavage at angles of 88° and 92°, the second, a clear, glassy mineral which does not cleave or part, but rather shatters with a conchoidal fracture. Under closer examination, both the groundmass and the phenocrysts of the stone are found to consist chiefly or solely of a very pure enstatite. In addition to inclusions of nickel‐iron, the achondrite contains abundant small flakes of graphite, and a brown, platy mineral, identified tentatively as diallage. For both the cleavage enstatite and the glassy enstatite, α = 1.652, β = 1.654, γ = 1.660; and, furthermore, the other optical constants are the same, except that the axial angle found for the glassy enstatite (80° to 85°) is more than twice that found for the cleavage enstatite (40°). Primary, secondary, and tertiary fusion crusts, ranging in thickness from at least 17.7 mm. down to less than 0.2 mm., have been found on the achondrite. Those portions of the fusion rind so far examined microscopically in oil immersions were found to be extremely fine‐crystalline, and not glassy, and they had an average index of

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00074.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

ABSTRACTIn recent issues of these Contributions, certain Russian news releases concerning the fall of crater‐producing meteorites in the Ussuri Taiga in eastern Siberia, on 1947 February 12, are quoted or abstracted. It is the purpose of this paper to record other Russian news items concerning this fall, and to point out the existence of internal inconsistencies in all such news reports; also surprising discrepancies, on the one hand, between them and the information on the Ussuri fall published by Russian meteoriticists, and, on the other hand, between them and the numerous concordant reports relating to the great Podkamennaya Tunguska, Siberia (± 1019,609), fall of 1908 June 30. A summary of the information on the Ussuri fall given in recent important papers by E. L. Krinov is presented, and attention is called to a program for the translation of Russian papers, such as Krinov's, on meteoritics, initiated in 1934–35 at the Ohio State University, by Dr. A. G. Wiens and the writer, and now resumed at the Institute of Meteoritics of the University of New Mexico by the writer, in cooperation with Dr. Alexander W. Boldy

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00075.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

ABSTRACTJosephinite is a naturally‐occurring, terrestrial nickel‐iron alloy, found along Josephine Creek, Josephine County, Oregon, and associated with stream gravels as water‐worn pebbles, sometimes ellipsoidal in shape. A group of more than 75 specimens examined gave the following physical and chemical data: average sp. gr., 5.66; hardness, 4.5 to 5.0; streak, lead‐gray; luster, metallic; fracture, hackly; malleable, sectile; strongly magnetic; opaque. The group of specimens examined ran as follows: largest dimension, 3.2 mm. to 31.4 mm. The chemical formula for josephinite is written usually as Fe2Ni5, altho josephinite contains also a little cobalt, phosphorus, and

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00076.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

ABSTRACTThis note presents a brief description of a possible meteorite crater found in northeastern New Mexico, in December, 1948, during an air search for another meteoritic fall.

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00077.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

ABSTRACTIt is proposed that any subclass of meteorite that may in future be required be named for thefallthat proves to be the archetype of the subclass;e.g., if the Norton County, Kansas‐Furnas County, Nebraska (1000,400), fall of 1948 February 18 be found to represent a new subclass, this would well be termednortonite, with the symbol A2n

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00078.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00079.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

ABSTRACTA spectrum of a Perseid meteor, observed on 1948 August 11, from a place near Blairsden, Plumas County, California, is discussed. This spectrum exhibits, along successive segments of the visible path of the meteor, the characteristics of all 3 spectral types,Z, X, Y, in that order. These variations in the spectrum of a single meteor substantiate the hypothesis that differences in meteor spectra result from changes in the excitation of the meteoritic vapor, rather than from differences in the composition of the meteorites themselves.

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00080.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

ABSTRACTWeighed pieces of Canyon Diablo, Arizona, oxide were reduced to metal by heating in hydrogen. In two cases, the oxide was analyzed before reduction, and the resulting metal was analyzed after reduction. From the data obtained, it is possible to calculate the oxygen content of the original oxide by three different methods. The results are in fair agreement, and indicate an oxygen content of about 29%.

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00081.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1949.tb00082.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY