title: Spectroscopic characterization of manganese minerals.
abstract: Manganese minerals ardenite, alleghanyite and leucopoenicite originated from Madhya Pradesh, India, Nagano prefecture Japan, Sussex Country and Parker Shaft Franklin, Sussex Country, New Jersey respectively are used in the present work. In these minerals manganese is the major constituent and iron if present is in traces only. An EPR study of on all of the above samples confirms the presence of Mn(II) with g around 2.0. Optical absorption spectrum of the mineral alleghanyite indicates that Mn(II) is present in two different octahedral sites and in leucophoenicite Mn(II) is also in octahedral geometry. Ardenite mineral gives only a few Mn(II) bands. NIR results of the minerals ardenite, leucophoenicite and alleghanyite are due to hydroxyl and silicate anions which confirming the formulae of the minerals.
authors.affiliation: Dept. of Physics, SVD College, Cuddapah 516 003, India.
authors.forename: S
authors.initials: S
authors.lastname: Lakshmi Reddy
authors.forename: K
authors.initials: K
authors.lastname: Padma Suvarna
authors.forename: G
authors.initials: G
authors.lastname: Udayabhaska Reddy
authors.forename: Tamio
authors.initials: T
authors.lastname: Endo
authors.forename: R L
authors.initials: RL
authors.lastname: Frost
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D007194:India; D008345:Manganese / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D019265:Spectroscopy, Near-Infrared
chemical_list: D008903:Minerals; D017640:Silicates; D008345:Manganese
keywords: Alleghanyite; Ardenite; EPR; Leucophoenicite minerals; Mn(II); Optical absorption