Formule chimique: CaAl2Si2O8
Famille: Silicates
Statut: IMA-GP
Système cristallin : Triclinique
Minéral de vitrine: NON
Couleurs UV longs (365nm): |
Blanc jaunâtre (crème) , | ||
Couleurs UV courts (254nm): |
Blanc , Rouge , | ||
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Pas de données
Thermoluminescence: OUI
Activateur(s): Fe3+, Sm3+, Eu3+, Dy3+, Nd3+,
Pics dans le spectre (nm):
Fe3+ (?) : broad band at 700 or 728 or 752nm (exc. 532nm) Eu3+ : 588, 611nm
Pas d'image de spectre pour l'instant
Excitation by CW laser with 532 and 780 nm revealed several broad bands and narrow luminescence lines. Narrow lines peaking at 588 and 611 nm evidently belong to Eu3+ luminescence as in synthetic anorthite artificially activated by Eu (Yu et al. 2012). The most probable substitution is for one of the Ca2+ sites. Other narrow lines in visible and NIR spectral ranges may be connected with Dy3+, Sm3+and Nd3+. Two broad emission bands evidently present peaking at 700 and 752 and often they present together resulting in emission with intermediate maximum (728nm). Those bands interpretation needs decay time study, but preliminary it may be supposed that they are connected to Fe3+ in tetrahedral coordination in Si and Al positions. Al and Si atoms both occupy tetrahedral sites with 4 coordinated oxygen atoms, while one type of Ca2+ ion occupies an octahedral site with six oxygen atoms and other Ca2+ ions occupy three kinds of polyhedral sites with 7 coordinated oxygen atoms with different Ca-O bond distance. (Gaft)
(*)Les commentaires sur les spectres sont uniquement rédigés en Anglais
(*)Les données ne sont pas exhaustives et sont limitées à quelques localités remarquables pour la fluorescence
http://www.mindat.org/show.php?name=Anorthite
http://webmineral.com/data/Anorthite.shtml
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