Chemical Formula: (Ca,RRE)CaNa2Be2Si4O12(F,O)2
Familly: Silicates
Status: IMA-GP
Crystal System: Orthorhombic
Mineral for Display: No
UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Long Waves (365nm): | Violet Pink | Strong | Mid waves (320 nm): | Violet Pink | Very Strong | Short Waves (254 nm): | Pink | Strong |
Other colors LW: | Blue , Purple pink , | ||
Other colors MW: | Purple pink , | ||
Other colors SW: | Blue , Purple pink , |
Daylight Picture
LEUCOPHANITE, Saga, Tvedalen, Norway;
Col. G.Barmarin; Photo: G. Barmarin
Long Waves Picture (365nm)
LEUCOPHANITE, Saga, Tvedalen, Norway;
UVLW
Col. G.Barmarin; Photo: G. Barmarin
Short Waves Pictures (254nm)
LEUCOPHANITE, Saga, Tvedalen, Norway;
UVSW
Col. G.Barmarin; Photo: G. Barmarin
Galerie de photos:
...To the gallery (4 images in the gallery)
UV Type | Color | Intensity | Observation Frequency |
---|---|---|---|
Long Wave (365nm): | Bluish | Short Waves (254 nm): | Bluish |
Triboluminescence: Yes
Thermoluminescence: Yes
To compare with meliphanite.
Most Common Activator: Ce3+
Other activators: Eu2+ , Sm3+ , Dy3+ , Tb3+ , Mn2+ , Nd3+ ,
Peaks in the spectrum (nm):
Ce3+ repl. Ca2+ : 375, 411, 450nm
Eu2+ : 466-470nm
Tb3+ : 546nm
Sm3+: 607nm
Dy3+: 475, 488, 576nm
Nd3+: 885, 1060nm
Mn2+: 610nm
Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.
To the spectrum gallery (1 spectra in the gallery)
Activators: a combinaison of RE elements - for exemple Ce3+ substituting to Ca (blue luminescence) and Mn (red luminescence) giving the magenta color (an orange flash typical of Mn(?) is seen on some samples). Cathodoluminescence: intense light-blue. The application of multiple forms of excitation (Friis et al. 2011) revealed that the UV-Blue emission in leucophanite and meliphanite consists of more than one emission center and is therefore more complex than previously thought. The most likely centers are defects related to the structure, e.g. in connection with the tetrahedral sites, and a Ce3+ centre. The difference in Na/Ca ratio between the two minerals make it possible for REE to substitute into two sites in meliphanite contrary, to just one in leucophanite. (Gaft)
Activators: Ce 3+, Eu 2+, Sm 3+, Dy 3+, Tb 3+, Nd 3+, Mn2+ substituting to Ca2+ (Gorobets in Gaft);
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Images:
http://www.mindat.org/show.php?name=Leucophanite
http://webmineral.com/data/Leucophanite.shtml
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