New morphological, chemical, and structural data of woolly erionite-Na from Durkee, Oregon, USA

作者：Cametti Georgia^*; Pacella Alessandro; Mura Francesco; Rossi Marco; Ballirano Paolo

来源：American Mineralogist, 2013, 98(11-12): 2155-2163.

DOI：10.2138/am.2013.4474

• Erionite-Na
• Durkee Oregon
• woolly morphology
• crystal-chemistry
• crystal structure
• Rietveld method
• scanning electron microscopy
• laboratory parallel-beam transmission X-ray powder diffraction

A detailed morphological, crystal-chemical, and structural characterization of erionite from the type locality of Durkee, Oregon, has been carried out by combining field emission scanning electron microscopy (FESEM) and laboratory parallel-beam transmission X-ray powder diffraction (XRPD). According to the crystal-chemical formula (Na5.38K1.99Mg0.24)[Al7.66Si28.34O72.09]center dot 29.83H(2)O, the sample has been classified as erionite-Na. The Rietveld refinement has indicated that the extraframework cations are located at three Ca1, Ca2, and Ca3 sites, the first one containing all available Mg. Moreover, the absence of the additional K2 site found in both dehydrated erionite and erionite-K has been demonstrated for this erionite sample. Furthermore, our results revealed the absence of Fe and Ca although previous investigations have reported the presence of a variable content of both these elements in erionite samples from Durkee. This is relevant information because it is well known from amphibole asbestos that Fe2+ has been claimed to be one of the causes of carcinogenesis by participating in Fenton chemistry and producing free radicals.

• 出版日期2013-12