Chemical Formula: NaCa2Si4O10F
Familly: Silicates
Status: IMA-A
Crystal System: Triclinic
Mineral for Display: Yes
UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Long Waves (365nm): | Pink | Very weak | Mid waves (320 nm): | Violet Pink | Strong | Short Waves (254 nm): | Violet Pink | Medium | Always |
Daylight Picture
AGRELLITE, Kipawa River, Quebec, Canada;
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author
Short Waves Pictures (254nm)
AGRELLITE, Kipawa River, Quebec, Canada;
OC (254 nm).
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author
UV Type | Color | Intensity | Observation Frequency |
---|---|---|---|
Long Wave (365nm): | None by naked eye | Mid Waves (320 nm): | None by naked eye | Short Waves (254 nm): | Yellowish White | Medium |
Sometimes associated with : hyalite (fluo green SW), VLASOVITE (fluo yellow-orange SW), feldspath (fluo red SW), red eudyalite and brown mosandrite; Some SW 4 color specimens from the Darai-Pioz Glacier, Tajikistan. have white fluorescing Baratovite, Pink fluorescing Agrellite, Magenta fluorescing Microcline, and an unknown fluorescing Green (hyalite?).
Most Common Activator: Mn2+
Other activators: Fe3+ , Eu2+ , Ce3+ , Sm3+ , Dy3+ , Nd3+ , Gd3+ ,
Peaks in the spectrum (nm):
Mn2+ replacing Ca2+: Large band peaking at 580nm
Eu2+: 410nm
Sm3+: 560, 597, 602, 640nm
Dy3+: 475, 485, 580nm
Fe3+ replacing Si4+: 740nm
Nd3+(?): 955nm
Ref. sample: (555), (561), 566, (593), (600), 604, (612), (639), 646, 661, 698 and 706 nm
Agrellite, Canada. Excitation: laser 405nm. Col. G. Barmarin; Spectre: G. Barmarin
A brief but distinctive orange flash is seen before the magenta luminescence (typical of Mn activator?). There is sometime a green fluorescent mineral accompagning agrellite. It is sometime reported as thorium activated calcite (???) that will glow green sw and mw whitish green lw and will phos under all 3 waves. Sometime thorite coating are invoqued to explain the green fluorescence in specimens from Kipawa. Albite fluorescing red SW is also often present.
RE elements (RRE2+ and RRE3+) replacing Ca2+ are suspected as activators. Also Mn and Fe.
Fluorescence: pink LW after Robbins and other authors, clearly visible with pointer-laser @405nm.
As with other minerals activated by RRE, the shape of the spectrum is strongly influenced by the resolution of the spectrometer because RRE have a lot of very narrow peaks very close from each other. If the resolution of the spectrometer is not sufficient, the pikes are agglomerated in larger entities.
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Images:
Videos:
http://www.mindat.org/show.php?name=Agrellite
http://webmineral.com/data/Agrellite.shtml
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