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Raman spectroscopy of the basic copper arsenate mineral: euchroite
Author(s) -
Frost Ray L.,
Čejka Jiří,
Sejkora Jiří,
Plášil Jakub,
Bahfenne Silmarilly,
Palmer Sara J.
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2473
Subject(s) - raman spectroscopy , arsenate , copper , chemistry , mineral , infrared , infrared spectroscopy , spectroscopy , molecule , analytical chemistry (journal) , arsenic , environmental chemistry , optics , physics , organic chemistry , quantum mechanics
Raman spectroscopy complemented with infrared spectroscopy was used to study the molecular structure of the mineral euchroite, a mineral involved in a complex set of equilibria between the copper hydroxy arsenates: euchroite Cu 2 (AsO 4 )(OH)·3H 2 O → olivenite Cu 2 (AsO 4 )(OH) → strashimirite Cu 8 (AsO 4 ) 4 (OH) 4 ·5H 2 O → arhbarite Cu 2 Mg(AsO 4 )(OH) 3 . The Raman bands observed at 848 and 768 cm −1 are assigned to the ν 1 and ν 3 (AsO 4 ) 3− stretching vibrations. Two Raman bands at 358 and 385 cm −1 are attributed to the ν 2 (AsO 4 ) 3− bending mode and two Raman bands at 441 and 474 cm −1 to the ν 4 AsO 4 3− bending modes. Two sharp Raman bands are observed at 3470 and 3537 cm −1 and are attributed to the stretching vibrations of hydroxyl units. A comparison of the Raman spectrum of euchroite is made with the other copper hydroxy arsenate minerals including strashimirite, olivenite, cornubite, and cornwallite. Copyright © 2009 John Wiley & Sons, Ltd.