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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
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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
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

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