Scheelite (CaWO4)
Fluorescent coloration
Source = New Mexico
Size = about 2" x 2” x 1".

50x
No sublimates, despite intense heat from oxidizing flame and did not want to explode due to trapped water.
Surprisingly, some metal is being formed, and parts that did not fuse well remain fluorescent.
Image Created with a Reichert monocular microscope coupled to a ccd camera & computer.
Color = almost correct, except where shadows and external light source is being reflected.