Cation site distribution in clinochlores: a NIR approach

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Abstract:

A near infrared (NIR) spectroscopy approach was undertaken to collect information on the Al cationic distribution in tetrahedral and octahedral sites in natural chlorite (clinochlore) samples. Structural formulae were established using electron microprobe and Mössbauer spectroscopy. A band located near 7115 cm - 1 was attributed to the overtone of OH fundamental stretching mode of Mg2AlOH and increases with the total Al amount. Good correlation was obtained between the (SiAl)O-OH vibration band area and tetrahedral Al content, making it easy to partition Al (and thus Fe3+) between octahedral and tetrahedral sites.

Keywords: CRYSTAL CHEMISTRY; EYWORDS; K CHLORITE; MOSSBAUER SPECTROSCOPY.; NIR

Document Type: Review Article

DOI: http://dx.doi.org/10.1180/0009855033830099

Publication date: September 1, 2003

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