title: Raman spectroscopy of newberyite, hannayite and struvite.
abstract: The phosphate minerals hannayite, newberyite and struvite have been studied by Raman spectroscopy using a thermal stage. Hannayite and newberyite are characterised by an intense band at around 980cm(-1) assigned to the v(1) symmetric stretching vibration of the HPO(4) units. In contrast the symmetric stretching mode is observed at 942cm(-1) for struvite. The Raman spectra are characterised by multiple v(3) anti-symmetric stretching bands and v(2) and v(4) bending modes indicating strong distortion of the HPO(4) and PO(4) units. Hannayite and newberyite are defined by bands at 3382 and 3350cm(-1) attributed to HOPO(3) vibrations and hannayite and struvite by bands at 2990, 2973 and 2874 assigned to NH(4)(+) bands. Raman spectroscopy has proven most useful for the analysis of these 'cave' minerals where complex paragenetic relationships exist between the minerals.
authors.affiliation: Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Qld. 4001, Australia. r.frost@qut.edu.au
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: Matt L
authors.initials: ML
authors.lastname: Weier
authors.forename: Wayde N
authors.initials: WN
authors.lastname: Martens
authors.forename: Dermot A
authors.initials: DA
authors.lastname: Henry
authors.forename: Stuart J
authors.initials: SJ
authors.lastname: Mills
mesh_terms: D017616:Magnesium Compounds / Q000737:chemistry*; D008968:Molecular Conformation; D010710:Phosphates / Q000737:chemistry*; D010756:Phosphoric Acids / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D000069877:Struvite; D013816:Thermodynamics
chemical_list: D017616:Magnesium Compounds; D010710:Phosphates; D010756:Phosphoric Acids; C510106:hannayite; C030781:magnesium phosphate; D000069877:Struvite