Record details

Title
    The crystal chemistry of paulingite
Statement of responsibility
    Elio Passaglia, Alessandro F. Gualtieri, Eugenia Marchi
Author
    Gualtieri, Alessandro F.
    Marchi, Eugenia
    Passaglia, Elio
Language
    anglicky
Source title - serial
    European journal of mineralogy
Vol./nr.
    Vol. 13, no. 1
Pages
    p. 113-119
Year
    2001
Notes
    3 obr., 2 tab., 14 bibl.
    il.
    Zkr. název ser.: Eur. J. Mineral.
Subject group
    analýza termogravimetrická
    bazalt
    dehydratace
    krystalochemie
    mřížkové parametry
    sodík
    zeolity
Geographical name
    ČR-Čechy
    Kanada-British Columbia
    Pražská plošina-Vinařická hora
    SRN
    USA
    Velká Británie-Northern Ireland
Keyword
    Chemistry
    Crystal
    Paulingite
Abstract (in english)
   The crystal chemistry of the uncommon zeolite paulingite, [(K, Na, Ca 0.5, Ba 0.5) 10 (Al 10 Si 32 O 84).30 H2O; Z = 16] is updated and revised on the basis of chemical compositions and cell constants of ten samples representative of almost all the occurrences known to date. The framework cation content, defined as R = Si/(Si+Al), shows slight variations ranging from 0.73 to 0.79. The extraframework cations are mainly K, Ca, Na, and minor Ba. Mg and Sr are absent or negligibe. The K, Ca and Na contents are extremely variable so that all three types of cation-dominance are found. The cell constant shows small variations (from 35.03 to 35.24 A) and no significant correlation with the chemical variables. The (K+Na) content is positively correlated with the Si content, and a strong negative correlation between Ca and Na is found. The water content is variable and independent upon the chemical parameters.
   The dehydration process of the Ca-dominant sample is significantly different from that of both K- and Na-dominant samples
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    15. 8. 2007
Import date
    8. 8. 2012