Synthesis and infrared spectroscopy of amphiboles along the tremolite-pargasite join

Authors: Della Ventura, Giancarlo; Hawthorne, Frank C.; Robert, Jean-Louis; Iezzi, Gianluca

Source: European Journal of Mineralogy, Volume 15, Number 2, 1 April 2003 , pp. 341-347(7)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

Amphiboles along the tremolite-pargasite join have been hydrothermally synthesized at 900°C, 3 kbar. Run products were characterized by optical and electron microscopy, powder X-ray diffraction and infrared spectroscopy. Under the experimental conditions used, there is complete solid-solution between tremolite and pargasite and the variation of cell parameters is linear as a function of composition. The infrared spectra in the principal OH-stretching region are consistent with the predictions of Hawthorne (1997) on local bond-valence grounds, and show strong short-range order of cations at the octahedral sites and strong coupling between Al at T(1) and Na at A.

Keywords: SYNTHESIS; TREMOLITE-PARGASITE; CELL-PARAMETERS; INFRARED SPECTRA; SHORT-RANGE ORDER

Document Type: Research article

DOI: 10.1127/0935-1221/2003/0015-0341

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