Record details

Title
    On zeophyllite from Radejčín, České středohoří Mts.: X-ray and IR-investigations
Statement of responsibility
    W. Mikenda, Franz Pertlik, Pavel Povondra, Jaromír Ulrych
Other titles
    Über Zeophyllit aus Radzein, Böhmisches Mittelgebirge: Röntgen- und IR-Untersuchungen
Author
    Mikenda, W.
    Pertlik, Franz
    Povondra, Pavel, 1924-
    Ulrych, Jaromír
Language
    anglicky
Source title - serial
    Mineralogy and petrology
Vol./nr.
    Vol. 61, no. 1-4
Pages
    p. 199-209
Year
    1997
Notes
    4 obr., 6 tab., 2 s.bibl.
    Německé resumé
    Zkr. název ser.: Mineral. and Petrology
Subject group
    difrakce rentgenová
    fylosilikáty
    krystalová struktura
    nefelinit
    spektrometrie IR
    vulkanity Českého středohoří
Geographical name
    ČR-Čechy
    Radejčín (Ústí nad Labem)
    Velké Březno (Ústí nad Labem)
Keyword
    České
    IR-investigations
    Mts
    Radejčín
    Středohoří
    X-ray
    Zeophyllite
Abstract (in english)
   redetermination of the crystal structur e of zeophyllite, idealized Ca13 Si10 O28 F10.6H2O [a=9.377(2),, c=36.57(2) A; Z=3], space group R3 (No.148) yielded R=0.33 for 2238 observed single crystal X-ray data (Fo3 oFo). The atomic coordinates in combination with the anisotropic thermal displacement parameters as well as the internal R-value from merging equivalent intensities gave no evidence for a violation of trigonal symmetry. The structure is characterized by SiO4 tetrahedra combined to open branched vierer single layers in an arrangement normal to the threefold axes. These layers are connected via Ca(O,F)x polyhedra and hydrogen bridges to a framework with a pronounced cleavage parallel to (00.1). The statistic occurrence of Si-OH groups in parts of the structure was confirmed by IR-investigations
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    27. 10. 2009
Import date
    8. 8. 2012