SIMPSONITE AND THE NORTHERN BRAZILIAN PEGMATITE REGION

Research Article| May 01, 1945 SIMPSONITE AND THE NORTHERN BRAZILIAN PEGMATITE REGION FREDERICK H POUGH FREDERICK H POUGH AMERICAN MUSEUM OF NATURAL HISTORY, NEW YORK 24, N. Y. Search for other works by this author on: GSW Google Scholar Author and Article Information FREDERICK H POUGH AMERICAN MUSEUM OF NATURAL HISTORY, NEW YORK 24, N. Y. Publisher: Geological Society of America Received: 06 Apr 1945 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1945, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1945) 56 (5): 505–514. https://doi.org/10.1130/0016-7606(1945)56[505:SATNBP]2.0.CO;2 Article history Received: 06 Apr 1945 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation FREDERICK H POUGH; SIMPSONITE AND THE NORTHERN BRAZILIAN PEGMATITE REGION. GSA Bulletin 1945;; 56 (5): 505–514. doi: https://doi.org/10.1130/0016-7606(1945)56[505:SATNBP]2.0.CO;2 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 A study of the Alto do Giz, near Equador, Rio Grande do Norte, Brazil, reveals an interesting series of tantalum minerals including the rare aluminum tantalate, simpsonite. Crystals of this mineral are yellow brown, hexagonal in outline; c = .60978. It belongs to the hexagonal dipyramidal class C6h. Hardness 7½, specific gravity is 6.81. It fluoresces blue to white in a cold quartz mercury vapor lamp with a filter. It is also found in white crystals at this mine and in buff-colored crystals at the Onça Mine, some miles away. It appears to be a replacement mineral of a short complex pegmatite sequence, crystallizing after microlite and tantalite. 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.