title: Characterisation of prehnite by EPMA, Mössbauer, optical absorption and EPR spectroscopic methods.
abstract: A sample of prehnite from Rayalaseema zone of Andhra Pradesh, India containing about 2.565 wt.% Fe(2)O(3) is used in the present work. The mineral has been characterized by EPMA, optical absorption, EPR, NIR and Mössbauer techniques. Mössbauer studies confirm the presence of iron as an impurity in two sites. An EPR study on powder sample confirm the presence of Fe(III) impurity in the mineral. Optical absorption spectrum also indicates that Fe(III) impurity is present in two sites with octahedral structure. NIR results are due to water fundamentals.
authors.affiliation: Department of Chemistry, S.V.U.P.G. Centre, Kadapa 516003, India.
authors.forename: N C Gangi
authors.initials: NC
authors.lastname: Reddy
authors.forename: S Md
authors.initials: SM
authors.lastname: Fayazyddin
authors.forename: R Rama Subba
authors.initials: RR
authors.lastname: Reddy
authors.forename: G Siva
authors.initials: GS
authors.lastname: Reddy
authors.forename: S Lakshmi
authors.initials: SL
authors.lastname: Reddy
authors.forename: P Sambasiva
authors.initials: PS
authors.lastname: Rao
authors.forename: B Jagannatha
authors.initials: BJ
authors.lastname: Reddy
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D007194:India; D013053:Spectrophotometry / Q000379:methods*; D015204:Spectroscopy, Mossbauer / Q000379:methods*; D028561:Transition Elements / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D005290:Ferric Compounds; D028561:Transition Elements; C510100:prehnite