Certain generalisations can now be made.     

* Shortwave typically produces a stronger and more pervasive result than 
longwave.   

* Longwave does not always produce a response.   

* Shortwave tends to produce a response low in the visible spectrum (e.g.
green colours).   

* Longwave tends to produce colours higher in the visible spectrum (e.g. 
yellows, oranges, reds).   

* Most quartzites did not fluoresce.  (Exceptions: Quitaque with a mottled 
green-grey and Spanish Diggings with a weak-green to green-grey response, 
both under shortwave.)   

* Iron-rich rocks, such as jasper and taconite, did not fluoresce.    

* Glassy rocks such as obsidian, occasionally had a reddish tint, but did 
not usually otherwise fluoresce. (Exception was an Oregon mahogany obsidian 
which had a strong red response.)   

* Agates, chalcedony, and opalised materials often fluoresced.    

* Silicified materials were variable, but when they did fluoresce, tended 
to be very colourful.     

* Dark cherts seldom fluoresced.     

* Patination had a strong positive correlation with fluorescence: thicker 
patination corresponded with reduced fluorescence. (Exception: strongly 
fluorescent materials such as opalites and opalised (?) coral fluoresced 
anyway.)   

* Lichens fluoresce (orange was observed).   

* A coating invisible under normal light produces a bright orange 
fluorescence which obscures sample fluorescence.  This may be caliche, as 
it was observed regularly and only on samples from arid to semi-arid 
environments.  (These findings are in agreement with comments made in 
Kinnunen et al.) (1985: 19).     
 
(Information from the literature which might pertain to the observations: 
Pale cherts are typically purer. Red cherts are coloured by hematite and 
clay minerals (ca. 4% Fe total).  Green cherts are often coloured by green 
chloritic minerals, such as ferrous silicates.  The colour is not red  
because the iron is in a reduced state.  McDougall notes that "most 
substances with a strong luminescence are white or only slightly coloured" 
(1952: 435-6), and that "patchy fluorescence" is due to "scattered 
activator centres".)