Skip Navigation

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by ZIES, E. G.
Right arrow Articles by CHAYES, F.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Petrology | Volume 1 | Number 1 | Pages 86-98 | 1960
© Oxford University Press 1960

research-article

Pseudoleucite in a Tinguaite from the Bearpaw Mountains, Montana

E. G. ZIES and F. CHAYES

Geophysical Laboratory, Carnegie Institution of Washington Washington, D.C.

ABSTRACT

The article presents chemical analyses of the pseudoleucite and groundmass of a pseudoleucite tinguaite, chemical analyses of the principal minerals, chemical estimates of the mode of the groundmass, and both chemical and micrometric modes of the pseudoleucite. The principal minerals are hedenbergitic acmite, a nepheline containing 2.3 per cent Fe2O3 and 7.9 per cent K2O, and K-feldspar containing a little BaO and very little Na2O. The micrometric mode of the pseudoleucite, in satisfactory agreement with the chemical mode, is nepheline 29.8 per cent, K-feldspar 66.2 per cent, acmite 3.0 per cent; the chemical mode of the groundmass is nepheline 26.8 per cent, K-feldspar 46.6 per cent, and acmite 26.7 per cent. A new analysis of a nepheline from the Bancroft area, made to test the analytical procedure, is also included.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.