Chemical Formula: Al2Si2O5(OH)4 2H2O
Familly: Silicates
Status: IMA-A
Mineral for Display: No
Associated names (luminescent varieties, discredited names, synonymes etc.): confolensite, lithomarge,UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Long Waves (365nm): | Yellowish White | Short Waves (254 nm): | Greenish white |
Other colors LW: | Bluish White , Pale Yellow , Greenish white , Yellowish , | ||
Other colors SW: | Bluish White , Yellowish White , Pale Yellow , Greenish Yellow , Green , Greenish , Brownish Green , Yellowish , |
Daylight Picture
HALLOYSITE, Beez, Belgium
;
Col. G.Barmarin; Photo: G. Barmarin
Long Waves Picture (365nm)
HALLOYSITE, Beez, Belgium
; UVLW
Col. G.Barmarin; Photo: G. Barmarin
Short Waves Pictures (254nm)
HALLOYSITE, Beez, Belgium
; UVSW
Col. G.Barmarin; Photo: G. Barmarin
Most Common Activator: (UO2)2+ (Uranyl ion) as impurities
Peaks in the spectrum (nm):
UO22+ : 499, 519, 542, 565nm
Halloysite, Beez (Namur), Belgium.
Excitation: Superbright 254nm. Col. G. Barmarin; Spectre: G. Barmarin
Typical spectrum of Uranyl Impurities
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
From a locality in an alkali feldspar in the Ukranian Shield. Fluoresces red. Strong orange fluorescence in MW, with a strong enduring phosphorescence in the same color
http://www.mindat.org/show.php?name=Halloysite-10a
http://webmineral.com/data/Halloysite-10a.shtml
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