Hostname: page-component-7b7567c8c-fvjsw Total loading time: 0 Render date: 2026-11-13T18:23:16.049Z Has data issue: false hasContentIssue false
  • English
  • Français

New structural and spectroscopic data for eosphorite

Published online by Cambridge University Press:  05 July 2018

M. A. Hoyos,
T. Calderon,
I. Vergara and
J. Garcia-Solé
M. A. Hoyos
Affiliation:
Dept. Quimica-Agricola-Geologia y Geoquìmica Univ. Autònoma de Madrid, Cantoblanco, Spain
T. Calderon
Affiliation:
Dept. Quimica-Agricola-Geologia y Geoquìmica Univ. Autònoma de Madrid, Cantoblanco, Spain
I. Vergara
Affiliation:
Dept. Fisica de Materiales, C-IV, Univ. Autònoma de Madrid, Cantoblanco, Spain
J. Garcia-Solé
Affiliation:
Dept. Fisica de Materiales, C-IV, Univ. Autònoma de Madrid, Cantoblanco, Spain
Get accessRights & Permissions [Opens in a new window]

Abstract

X-ray diffraction refinement of the crystal structure of eosphorite has been carried out with reference to the orthorhombic space group Cmca. The structure is similar to that previously described by Hanson (1960), but the standard deviations are improved. Optical absorption and photoluminescence have also been studied for this mineral. Two sharp emission lines, denoted as R1 and R2, superimposed to a broad band (630-750 nm) have been related to the presence of Cr3+ ions. The excitation spectrum of these emissions confirms that the absorption (excitation) bands centred at 431 nm and 585 are related to with 4A2 → 4T1 and 4A2 → 4T2 spin allowed transitions of this ion.

Keywords

eosphoritecrystal structureluminescence optical absorption

Information

Type
Crystal Structure
Information
Mineralogical Magazine , Volume 57 , Issue 387 , June 1993, pp. 329 - 336
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

Aguilar, M. and Osendi, M. I. (1982) Fluorescence of Mn2+ in CaCO3 J. Luminescence, 27, 365–77.Google Scholar
Barnes, W. H. (1949) The unit cell and space group of childrenite. Am. Mineral., 34, 12–18.Google Scholar
Barnes, W. H. and Shore, V. C. (1951) The childrenite—eosphorite problem. Ibid., 36, 509-11.Google Scholar
Braithwaite, R. S. W. and Cooper, B. V. (1982) Childrenite in South-West England. Mineral. Mag., 46, 119–26.Google Scholar
Hanson, A. W. (1960) The Crystal Structure of Eosphorite. Acta Cryst., 13, 384–7.Google Scholar
Hurlbut, C. S. Jr. (1950) Childrenite-eosphorite series. Am. Mineral., 35, 793–805. International Tables for X-ray Crystallography (1974) Kynoch Press, Birmingham, vol. 4.Google Scholar
King, G. S. D. and Sengier-Roberts, L. (1988) Drugma-nite Pb2(Feo. 78Al0. 22)H(PO)2OH2. Its crystal structure and place in the datolite group. Bull. Mineral., 111, 431–7.Google Scholar
Pappalardo, R. G., Walsh, J., and Hunt, R. B. (1983) Cerium-Actived Halophosphate Phosphors. I. Stromtium Fluorapatites. J. Electrochemical Soc., 130, 2087–96.Google Scholar
Powell, R. C., Lin, Xi, Xu Gang Quarles, G. J. Walling, J. C. (1985) Spectroscopic properties of alexandrite crystals. Phys. Rev. B., 32, 2788–97.Google Scholar
Stewart, J. M., Kundell, F. A., and Baldwin, J. C. (1976) The X-Ray system; Computer Science Center, University of Maryland, College Park MD.Google Scholar
Vergara, I., Garcia Sole, J., Hoyos, M. A., and Calderon, T. (1990) Fluorescence properties of Cr3+ in natural eosphorite crystals. Solid. St. Comm., 76, 284–92.Google Scholar