Scheikundige formule: LiAlSi2O6
Familie: Silicaten
Status:
Kristal Systeem: Monoklieniek
Mineraal om tentoon te stellen: Ja
Fluorescerende variëteiten: hiddenite, kunzite,UV Type | Kleur | Intensiteit | Frequentie van de observatie |
---|---|---|---|
Lange Golven (365nm): | Oranje rood (Zalmkleurig) | Korte Golven(254 nm): | Oranje |
Andere kleuren lange golven: | Oranje , Bruin , Oranje rood (Zalmkleurig) , Violet roos , Zalm roos , | ||
Andere kleuren korte golven: | Blauw , |
Lange golf foto (365nm)
OL (365 nm). Col. G. Barmarin; Photo: G. Barmarin
Foto galerij:
...Naar de volledige galerij (7 beelden in totaal)
UV Type | Kleur | Intensity | Observation Frequency |
---|---|---|---|
Lange golven(365nm): | Oranje | Midden Golven (320 nm): | Oranje | Korte golven (254 nm): | Oranje |
Tenebrescencie: Ja
Thermoluminescencie: Ja
Variety triphane (colorless), Kunzite (pink) and Hiddenite (green).
Voornaamste Activator: Mn2+
Andere activatoren: Cr3+ , Fe3+ ,
Pieks in het spectrum (nm):
Mn2+ substituting for Li : broad band around 595 - 615nm (10ms) Cr3+ : 676, 690nm (peak) Fe3+ : 685nm (5 ms)
Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.
Mn2+ is shown to be mainly in Li-sites rather than Al-sites and gives rise to a broad emission centered at 600 nm. In Cr-rich crystals only one R1 line is observed and Cr3+ emission is evident at room temperature. In green hiddenite crystals, Cr3+ emission is dominant at room temperature where the R-lines are superimposed on a broad-band emission. (Source: Luminescence spectroscopy of Cr3+ and Mn2+ in spodumene (LiAlSi2O6), WALKER G. see below). Spodumen is a monoclinic pyroxene with two not equivalent metal cation sites M1 and M2. The aluminum occupies the smaller M1 site, which is approximately octahedral (actual symmetry C2) with an average metal-oxygen distance of 1.92 A. The M2 site, occupied by Li, is also six-fold coordinated with an average metal-oxygen distance of 2.23 Å. Both Al and Li sites may be substitutionally replaced by ions of the transitional metals in various proportions. Both Mn2+ and Cr3+ centers have been identified in luminescence spectra by steadystate spectroscopy (Tarashchan 1978; Walker et al. 1997). Besides, long lived deep red luminescence was found supposedly generated by Fe3+ especially in the specimen fluorescing a bright lilac color under SW, light peach LW and having a violet (not pink) color in daylight. At room and lower temperatures only one emission band of Mn2+ occurs. It is very probable that Mn2+ ions in the spodumen matrix is present only in one site and that Mn2+ is mainly in Li-sites rather than Al-sites. (Gaft)
(*)Gegevens zijn niet exhaustieve, ze zijn beperkt tot de meest belangrijke plaatsen voor fluorescentie
Images:
http://www.mindat.org/show.php?name=Spodumene
http://webmineral.com/data/Spodumene.shtml
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