Chemical Formula: Ca12(Zr,Ti)4(Si2O7)4(O,F)8
Familly: Silicates
Status: IMA-A
Crystal System: Monoclinic
Mineral for Display: No
UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Short Waves (254 nm): | Pale Yellow | ||
Other colors SW: | Yellowish White , Yellowish , |
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
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.
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Images:
http://www.mindat.org/show.php?name=Baghdadite
http://webmineral.com/data/Baghdadite.shtml
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