Includes bibliographical references (p. 39-40) and index.
|Statement||by Margaret D. Foster.|
|Series||Shorter contributions to general geology, Geological Survey professional paper -- 354-B|
|The Physical Object|
|Pagination||iii, 11-49 p. :|
|Number of Pages||49|
INTERPRETATION OF THE COMPOSITION OF LITHIUM MICAS By MARGARET D. FOSTER ABSTRACT A study of more than analyses of lithium micas reported in the literature indicates that, compositionally, most of the lithium micas may be interpreted as if derived by isomorphous replace ment from muscovite or imeldaclyde.com by: Get this from a library! Interpretation of the composition of trioctahedral micas. [Margaret D Foster; United States. Department of the Interior.; Geological Survey (U.S.)] -- "A study of the compositional and layer charge relations of phlogopites, biotites, siderophyllites and lepidomelanes.". Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied. Part or all of this report is presented in Portable Document Format (PDF). For best results viewing and printing PDF documents, it is recommended that you download the documents to your computer and open them with Adobe Reader.
May 01, · Compositions and pleochroism of micas in fourteen peraluminous alkali-feldspar granites in the eastern part of the Late Proterozoic Arabian Shield are unlike those of micas (principally biotite) in most calc-alkaline granitoid rocks. Compositions of these micas are distinguished by elevated abundances of Li2O, F, and numerous cations and by low MgO imeldaclyde.com by: M. D. Foster, “Interpretation of the Composition of Trioctahedral Micas,” US Government Printing Office, Washington DC, , pp. Minor- and trace-element composition of trioctahedral micas: A review in trioctahedral micas. Solid line represents median or 50 th percentile. Interpretation of the trace-element contents. True and brittle micas: Composition and solid-solution series. frequent muscovite composition), which is taken as %. trioctahedral micas such as the Ti-rich brittle mica.
changes in pressure, temperature, or octahedral layer composition, because all these variables alter d, with-out changing d1. Predictions of compositional limits of trioctahedral micas Calculation of the upper temperature stability lim-its of trioctahedral micas (a: 0o) has been presented by Hazen ().In summary, micas of the composi-. Mar 01, · Moscovite-biotite intergrowths from Moinian mica schist at Glenfnnan probably represent a pair that grew under conditions of a thermodynamic equilibrium, at a temperature of (± 50) °C and a pressure of (± ) kbar. Both micas and garnet are characterized by full chemical analyses and some physical data (density, unit-cell parameters).Cited by: 2. papers on base exchange, the composition and swelling of clays, the layer charge relations of dioctahedral and trioctahedral micas, to name only a f ew. Her dedication to research in geochemistry is strongly brought into focus by the fact that though officially retired at 70 years of age in March. recent paper on micas (Tischendorf etal., ), we present in this paper a survey and analysis of composition and solid solution in the mica group, comprising trioctahedral and dioctahedral, common and uncommon true K micas, other alkali-element-bearing micas, and brittle micas. The principles behind the subdivision, and the.