Amphiboles along the tremolite-pargasite join have been hydrothermally synthesized at 900degreesC, 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.
DELLA VENTURA, G., Hawthorne, F.C., Robert, J.L., Iezzi, G. (2003). Synthesis and infrared spectroscopy of amphiboles along the tremolite – pargasite join. EUROPEAN JOURNAL OF MINERALOGY, 15, 341-347 [10.1127/0935-1221/2003/0015-0341].
Synthesis and infrared spectroscopy of amphiboles along the tremolite – pargasite join
DELLA VENTURA, Giancarlo;
2003-01-01
Abstract
Amphiboles along the tremolite-pargasite join have been hydrothermally synthesized at 900degreesC, 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
