Gmelinite [12251-35-3] specimens were analyzed by electron microprobe and their unit-cell dimensions were detd. by x-ray powder diffractometry. Four samples showed compositional zoning, the others being highly homogeneous. The mineral compn. ranges approx. from Al7Si17O48 to Al8.4Si15.6O48. The major exchangeable cations are Na and Ca. K and Mg are present in small amts., Ba is always absent, and Sr frequently absent. The lattice parameters are strongly correlated with the exchangeable-cation content: a increases and c decreases with increasing divalent-cation content.
The crystal chemistry of gmelinites / Passaglia, Elio; D., Pongiluppi; Vezzalini, Maria Giovanna. - In: NEUES JAHRBUCH FUR MINERALOGIE MONATSHEFTE. - ISSN 0028-3649. - STAMPA. - 1978:(1978), pp. 310-324.
The crystal chemistry of gmelinites
PASSAGLIA, Elio;VEZZALINI, Maria Giovanna
1978
Abstract
Gmelinite [12251-35-3] specimens were analyzed by electron microprobe and their unit-cell dimensions were detd. by x-ray powder diffractometry. Four samples showed compositional zoning, the others being highly homogeneous. The mineral compn. ranges approx. from Al7Si17O48 to Al8.4Si15.6O48. The major exchangeable cations are Na and Ca. K and Mg are present in small amts., Ba is always absent, and Sr frequently absent. The lattice parameters are strongly correlated with the exchangeable-cation content: a increases and c decreases with increasing divalent-cation content.
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