Abstract
Research Article| December 01, 1941 Igneous rocks of the Highwood Mountains, Montana: Part VI. Mineralogy E. S. LARSEN; E. S. LARSEN Search for other works by this author on: GSW Google Scholar C. S. HURLBUT, JR.; C. S. HURLBUT, JR. Search for other works by this author on: GSW Google Scholar B. F. BUIE; B. F. BUIE Search for other works by this author on: GSW Google Scholar C. H. BURGESS C. H. BURGESS Search for other works by this author on: GSW Google Scholar GSA Bulletin (1941) 52 (12_1): 1841–1856. https://doi.org/10.1130/GSAB-52-1841 Article history received: 26 Mar 1940 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation E. S. LARSEN, C. S. HURLBUT, B. F. BUIE, C. H. BURGESS; Igneous rocks of the Highwood Mountains, Montana: Part VI. Mineralogy. GSA Bulletin 1941;; 52 (12_1): 1841–1856. doi: https://doi.org/10.1130/GSAB-52-1841 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The minerals of the igneous rocks of the Highwood Mountains are described. The primary hornblende of the quartz latites is basaltic and it has been partly replaced by a common green hornblende. Hornblende is rare in the alkalic rocks. Augite is an abundant mineral of the alkalic rocks; in the syenites it contains some acmite, especially on the borders of the crystals. Aegirite is a common metamorphic mineral. The olivine of the shonkinites contains from 12 to 22 mol per cent of fayalite, that of the syenite from Square Butte 50 per cent. Monticellite twinned into trillings on (031) is an abundant mineral in one small intrusive body. In the alkalic rocks barium sanidine is abundant and plagioclase rare; leucite, primary analcime, and pseudoleucite are common and sodalite rare. Natrolite, thomsonite, and other zeolites are widespread and very abundant. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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