Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Albert Johannsen"'
Autor:
Albert Johannsen, C. A. Merritt
Publikováno v:
The Journal of Geology. 34:275-280
Various rock minerals were crushed and sifted to determine the relative losses through different sieves. It was found that these losses were not equal in different minerals, so that discarding the fines may introduce errors in proportions in percenta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15487ad946929e4275679c266b1ef632
https://doi.org/10.1086/623308
https://doi.org/10.1086/623308
Publikováno v:
The Journal of Geology. 22:625-629
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e767982189a8c7a78bea70efff02d98
https://doi.org/10.1086/622177
https://doi.org/10.1086/622177
Autor:
Albert Johannsen
Publikováno v:
The Journal of Geology. 36:283-286
North American igneous rocks are shown to be universally lighter in color (and therefore also in density) than European rocks of the same kind. Curves are given showing this color difference for granites, granodioritic-granites, rhyolites, gabbros, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc631011725b1716b05dd5db6f073b1f
https://doi.org/10.1086/623513
https://doi.org/10.1086/623513
Autor:
Albert Johannsen, Albert D. Brokaw
Publikováno v:
The Journal of Geology. 20:80-90
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::901fb391965926fb283f2b4fdeb407f2
https://doi.org/10.1086/621932
https://doi.org/10.1086/621932
Autor:
T. C. Phemister, Albert Johannsen
Publikováno v:
The Journal of Geology. 33:268-271
The Gaston rebound tester is used to determine the relative elasticities of various minerals. Under this test fluorite, pyrite, quartz, and garnet are shown to be more elastic than steel. The remarkable rebound of 97 per cent was obtained on garnet,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4e96f45bdc10c6926d91b5716a9eb6e3
https://doi.org/10.1086/623199
https://doi.org/10.1086/623199
Autor:
Albert Johannsen
Publikováno v:
The Journal of Geology. 27:276-285
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed8d79c4add0d2f97d46721e0a4f8a1b
https://doi.org/10.1086/622661
https://doi.org/10.1086/622661
Autor:
Albert Johannsen
Publikováno v:
The Journal of Geology. 19:317-322
It is obvious that a considerable part of the system of classification and nomenclature here proposed can only be applied upon microscopical or chemical investigation. .... For these reasons . . . . we are convinced of the need of general petrographi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a5da78c6834a8956b557c6268c4bc95
https://doi.org/10.1086/621852
https://doi.org/10.1086/621852
Autor:
Albert Johannsen, L. H. Adams, E. D. Williamson, E. T. Allen, E. G. Zies, B. Asklund, J. Austen Bancroft, W. V. Howard
Publikováno v:
The Journal of Geology. 34:475-478
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c59afe058ac25671659086a2bf623c1f
https://doi.org/10.1086/623334
https://doi.org/10.1086/623334
Autor:
Albert Johannsen
Publikováno v:
The Journal of Geology. 35:270-275
The terms "diabase" and "dolerite" are used with various meanings in different countries. In this paper the development of the terms is traced.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::607c9b7d2fac72f2659a35e3be391d4d
https://doi.org/10.1086/623407
https://doi.org/10.1086/623407
Autor:
Albert Johannsen, T. C. Phemister
Publikováno v:
The Journal of Geology. 32:81-84
A method is presented which to a large extent eliminates the errors of observation of the optic axial angle by the Michel-Levy method. Instead of standardizing circles of reference, observations on a mineral of known 2E are made directly through the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dac89488f34ba0c5eea0382679997675
https://doi.org/10.1086/623068
https://doi.org/10.1086/623068