Classification and a Scheme for the Identification of Layer Silicates

Research Article| October 01, 1961 Classification and a Scheme for the Identification of Layer Silicates CHARLOTTE M WARSHAW; CHARLOTTE M WARSHAW Dept. Geophysics and Geochemistry, Pennsylvania State University, University Park, Pa Search for other works by this author on: GSW Google Scholar RUSTUM ROY RUSTUM ROY Dept. Geophysics and Geochemistry, Pennsylvania State University, University Park, Pa Search for other works by this author on: GSW Google Scholar Author and Article Information CHARLOTTE M WARSHAW Dept. Geophysics and Geochemistry, Pennsylvania State University, University Park, Pa RUSTUM ROY Dept. Geophysics and Geochemistry, Pennsylvania State University, University Park, Pa Publisher: Geological Society of America Received: 01 Mar 1960 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1961, 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 (1961) 72 (10): 1455–1492. https://doi.org/10.1130/0016-7606(1961)721455:CAASFT2.0.CO;2 Article history Received: 01 Mar 1960 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 CHARLOTTE M WARSHAW, RUSTUM ROY; Classification and a Scheme for the Identification of Layer Silicates. GSA Bulletin 1961;; 72 (10): 1455–1492. doi: https://doi.org/10.1130/0016-7606(1961)721455:CAASFT2.0.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 The classification for the layer silicates (including most of the clay minerals) proposed here is based on structural studies of numerous investigators on natural materials. In many instances, however, the limits of chemical composition have been determined by research on synthetic layer silicates.The layer lattice silicates can be subdivided by the successive application of three criteria: (1) height of fundamental repeat unit or "thickness of layer"; (2) gross composition, whether diocta-hedral or trioctahedral, and ionic content of layers; (3) stacking sequence of layers and degree of orderliness of stacking.The relationship between compositional and structural divisions is clearly indicated in compositional diagrams. These show that some structurally similar families may be widely separated in composition (kaolinite and septechlorite), whereas others —e.g., phengites (micas) and beidellites—are not far apart with respect to bulk composition.A scheme of successive operations that will permit the identification of layer lattice silicates singly or in simple mixtures is outlined, particularly for the nonspecialist. The essential apparatus includes only that for powder X-ray diffraction and a small laboratory furnace. 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.