Database of luminescent Minerals

BAGHDADITE

Chemical Formula: Ca₁₂(Zr,Ti)₄(Si₂O₇)4(O,F)₈

Familly: Silicates

Status: IMA-A

Crystal System: Monoclinic

Mineral for Display: No

Luminescence:

Phosphorescence (in the common meaning of the term) seen by naked eye:

Main Activator(s) and spectrum:

Most Common Activator: Ti⁴⁺

Other activators:            TiO₆ ,

Peaks in the spectrum (nm):

 large band near 580nm and two small bands at 318 and 397nm 

TiO₆ : broad band at 525nm

Comments on activators and spectra:

The photoluminescence (PL) spectrum at 300 K consists of one large band near 580 nm and two small UV bands at 318 and 397 nm. The optical excitation spectrum of the bright yellow fluorescence consists of two bands near 220 and 250 nm. The temperature dependence of the PL intensity exhibits linear thermal quenching.

Baghdadite from Fuka, Okayama Prefecture, Japan shows a bright yellow fluorescence under UV (Hg 253.7 nm) excitation (Sidike et al. 2006) which was ascribed to the existence of titanium. Gaft study of decay time revealed that it is equal of approximately 10 μs, which corresponds to TiO₆ emission properties.

Best Locality for luminescence(*):

• Fuka mine, Fuka, Bicchu-cho, Takahashi City, Okayama Prefecture, Japan;

(*)Data are not exhaustive and are limited to the most important localities for fluorescence

Bibliographical Reference for luminescence:

• Luminescence Spectroscopy of Minerals and Materials, M. Gaft, R. Reisfeld, G. Panczer, Springer Editor, ISBN: 10 3-540-21918-8 ,

Luminescence Reference on internet:

• Yellow fluorescence from baghdadite and synthetic Ca3(Zr,Ti)Si2O9 by Aierken Sidike; I. Kusachi; N. Yamashita, Physics and Chemistry of Minerals, Volume 32, Number 10 / janvier 2006 (pp. 665-669).
• Helmut Braith on ebay

 

Images:

 

• Baghdadite, japan Yellow SW : https://www.mindat.org/photo-157673.html
• Baghdadite, japan Yellow SW : https://www.mindat.org/photo-794139.html

Mineralogical Reference on internet:

  http://www.mindat.org/show.php?name=Baghdadite

  http://webmineral.com/data/Baghdadite.shtml

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