Fluorescent granite
13-Jul-94 11:34:22
Sb: #137160-Fluorescent granite
Fm: Doug Mitchell 70621,702
To: Lanny R. Ream 73512,1163
Hi, Lanny–
Actually I failed to mention that the Asturias quartz phantoms are invisible
in daylight to my unaided eye, being clear only under UV. I had more or less
expected to find hydrocarbon inclusions become visible under the microscope;
since I did not, maybe it is something other than hydrocarbons doing the
fluorescing in this case (a Min. Rec. article on Asturias mentioned hydrocarbon
inclusions, and I think mentioned they were fluorescent, but told of no
fluorescent phantoms).
I have a topaz crystal from "Centerville, ID" much like you describe; it is
indeed a special specimen to me.
Fluorescent stilbite seems uncommon. I have one with a dim bluish fluorescence
and a one of the tiny solitary bright-green-fluorescing pips I find on a number
of specimens from many places, always wondering if it is willemite dust from
other specimens that got stuck there or some such. Are your stilbites more
impressive under UV?
I made up RM0020.ARC last week, but it is not in the library. My job has been
eating too much of my brain lately; perhaps I simply failed to upload it after
readying it. Anyway, I am uploading it this pass, so hope to find it in the
library tomorrow.
–Doug