Chemical Formula: Al2SiO5
Familly: Silicates
Status: IMA-GP
Crystal System: Triclinic
Mineral for Display: No
Associated names (luminescent varieties, discredited names, synonymes etc.): disthene, kyanite,UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Long Waves (365nm): | Red | Very weak | Often | Mid waves (320 nm): | Red | Very weak | Short Waves (254 nm): | Red | Very weak |
Other colors LW: | Yellowish White , Pale Yellow , Orange , Greenish white , Yellowish , | ||
Other colors MW: | Bluish White , Yellowish White , Greenish white , | ||
Other colors SW: | Bluish White , Yellowish White , Greenish white , |
Daylight Picture
Cyanite (Disthene), Russia.
Col. G. Barmarin; Spectre: G. Barmarin
Long Waves Picture (365nm)
Cyanite (Disthene)(Excitation: laser 405nm), Russia.
Col. G. Barmarin; Spectre: G. Barmarin
Galerie de photos:
...To the gallery (2 images in the gallery)
Most Common Activator: Cr3+
Other activators: TiO6 ,
Peaks in the spectrum (nm):
Cr3+ replacing Al (site A giving Doublet R-lines) : Lines at 688 or 689 and at 706nm Cr3+ (site B weak crystal field) : broad band peaking at 750nm Cr3+ (site C weak crystal field) : broad band peaking at 780-790nm (Gaft) TiO6 : very large band at 500-570nm (Gorobets)
Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.
To the spectrum gallery (4 spectra in the gallery)
Kyanite has four inequivalent Al3+ sites, which may be substituted by Cr3+. Red luminescence reported to Cr3+ replacing aluminium (Tarashchan in Gaft) but three different site for Cr3+ identified. The study of Cr3+ luminescence in kyanite has long history.
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Images:
http://www.mindat.org/show.php?name=Cyanite
http://webmineral.com/data/Cyanite.shtml
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