Chemical Formula: SnO2
Familly: Oxides and hydroxides
Status: IMA-GP
Crystal System: Tetragonal
Mineral for Display: No
UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Short Waves (254 nm): | Yellow | Weak | Rarely |
Other colors LW: | , | ||
Other colors SW: | Yellowish , |
Most Common Activator: Sn2+
Other activators: Sn3+ , W ,
Peaks in the spectrum (nm):
Sn2+ : very large band at 475nm (200nm half-width) Sn2+ : very large band at 535 - 537nm (140nm half-width) Sn2+ : very large band at 550 nm (140nm half-width)
Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.
To the spectrum gallery (2 spectra in the gallery)
Blue luminescence: activator W Yellow luminescence: Ti Under UV lamp excitation cassiterite samples are luminescent only at low temperatures. But with powerful laser excitation (337 nm) even at 300 K or at low temperature (77k) bright intrinsic luminescence (Sn2+ and Sn3+) (Gaft) The spectrum under powerful laser at 300K is similar to those at 77 K with lamp excitation. Decay time of luminescence has two components, namely 100 ns and 280 ns (Gaft and Vorontsova 1982; Gaft et al. 1988).
(Based on Cathodoluminescence, Waychunas)
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
http://www.mindat.org/show.php?name=Cassiterite
http://webmineral.com/data/Cassiterite.shtml
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