|Statement||by Margaret D. Foster.|
|Series||U.S. Geological Survey professional paper -- 414-A|
|Contributions||Geological Survey (U.S.)|
|The Physical Object|
|Pagination||iii, 33 p. :|
|Number of Pages||33|
Interpretation of the composition and a classification of the chlorites by Margaret Dorothy Foster, , U.S. Government Printing Office edition, in EnglishPages: This paper deals with a simplified procedure for classification of rock-forming chlorites based on chemical data obtained from electron microprobe analyses (EMPA). The proposed chlorite nomenclature does not include any new mineral name. The procedure gives the rules for determination of chlorite types (I and II), and adjectival modifiers (Mg-chlorite, Fe-chlorite, Al-chlorite).Cited by: composition to a general picture of chlorite constitution. Among these was Tschermak's () suggestion that the variations in chemical composition of the magnesian chlorites could be accounted for by assuming complete solid solution between serpentine, Mg3Si2Oa(OH)4, and . Abstract. The sheet silicate minerals of the chlorite group (compare with II) are generally subdivided according to their optical properties, which reflect their chemical composition (see Trochim in Tröger-Braitsch: proposals to the classification of chlorites from Tschermak, Orcel, Winchell, Hey, Brindley, Schüller a.o.). Albee distinguished the minerals of the four main subgroups Mg Author: Werner Smykatz-Kloss.
Normalization, ferric iron and H 2 O estimation. An existence of ferric iron as a primary component in chlorite group minerals has been discussed since the interpretation of the composition and a classification scheme of the chlorites (see Foster, ).Indirect estimation of ferric iron content of a chlorite analysis obtained from electron-microprobe technique by means of the Cited by: The chlorites are a group of phyllosilicate tes can be described by the following four endmembers based on their chemistry via substitution of the following four elements in the silicate lattice; Mg, Fe, Ni, and Mn.. In addition, zinc, lithium, and calcium species are known. The great range in composition results in considerable variation in physical, optical, and X-ray ry: Phyllosilicates. Most chlorites are trioctahedral in both sheets, i.e., the ferric iron content is low. Chlorites with dioctahedral layers and trioctahedral interlayer sheets are called ditrioctahedral chlorite (the reverse, tri-dioctahedral chlorite is unknown). Chlorite classification is further complicated by the existence of different stacking polytypes. Hey () suggested that chlorites be subdivided into "oxidized chlorites" and "unoxidized chlorites," depending on whether they contain more or less than 4 wt. % Fe, respectively. Chlorite analyses compiled by Foster () indicate an extent of Fe content.
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. The equiiibrium maximum stability temperature for the chlorites appears to reach a maximum at the composition of clinochlore (o C. at 20, psi) and to de-crease slightly (' C.) towards both penninite and amesite. The nomenclature and relations among the various chlorites is discussed in the light of this information. Kepezhinskas, K.B. () Composition of chlorites as determined from their physical properties. Doklady Akad Nauk. S.S.S.R., Earth Science Section, , – The ideal Mössbauer effect. Although the composition of chlorite group minerals represents a known proxy for conditions in various geological environments, few comparative studies of chlorites from different geological environments have been carried out. In this study, we compare chlorites from a hydrothermal system with those formed under low-grade metamorphic conditions. Both sets of samples were collected from the Cited by: 9.