Database of luminescent minerals 

BAGHDADITE

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

Family: Silicates

Status: IMA-A

Crystal system : Monoclinic

Display mineral: NON

Luminescence:

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Phosphorescence (in the common sense of the term) observable with the naked eye:

No data

Activator(s) and spectrum:

Activator(s): Ti⁴⁺, TiO₆,  

Peaks in the spectrum (nm):

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

TiO₆ : broad band at 525nm

No spectrum yet

Comments on spectrum and activators:

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 localities for fluorescence (*):

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

(*)The data are not exhaustive and are limited to a few remarkable localities for fluorescence

Bibliographic reference for luminescence:

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

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

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

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

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