Scheikundige formule: Ca4Be2Al2Si9O26(OH)2
Familie: Silicaten
Status: IMA-GP
Kristal Systeem: Orthorhombisch
Mineraal om tentoon te stellen: Nee
UV Type | Kleur | Intensiteit | Frequentie van de observatie |
---|---|---|---|
Lange Golven (365nm): | Oranje | Korte Golven(254 nm): | Geel |
Thermoluminescencie: Ja
Natural fibrous crystals of bavenite collected in intra-granitic pegmatite bodies of Bustarviejo (Madrid, Spain) have been examined (Garcia-Guinea et al. 2005). The strong luminescence emissions has been recorded.
Voornaamste Activator: Mn2+
Andere activatoren: Sm3+ , Dy3+ , Tb3+ , Gd3+ ,
Pieks in het spectrum (nm):
Gd3+ : 319nm Sm3+ : 562 and 594nm Dy3+ : 572nm Tb3+ : 495nm Mn2+ replacing Ca2+ : Broad band at 578nm (?) : lines at 656, 659nm
The bavenite luminescence takes place in the 5d electron shell that interacts strongly with the crystal field; the spectra bands assignment are Gd3+ (319 nm), Sm3+ (562 and 594 nm), Dy3+ (572 nm) and Tb3+ (495 nm). A Mn2+ band at about 578 nm in Ca2+ sites is present as a broad band that overlaps with the Dy3+, Sm3+ and Tb3+ bands. Mn2+ is a transition metal ion that has an electron configuration of 3d5 and interacts strongly with the crystal field (d → d) transition. (after The role of rare earth elements and Mn2+ point defects on the luminescence of bavenite, J. Garcia-Guinea, V. Correcher, A. Quejido, A. LaIglesia and N. Can, Talanta Volume 65, Issue 1, 15 January 2005, Pages 54-61)
(*)Gegevens zijn niet exhaustieve, ze zijn beperkt tot de meest belangrijke plaatsen voor fluorescentie
http://www.mindat.org/show.php?name=Bavenite
http://webmineral.com/data/Bavenite.shtml
Dokumenten in het Nederlands op Google
Dokumenten in alle talen op Google