Sorry, guys, but its neither xtals nor vegetation. I'm not at my computer at the moment, so I can't post another visual cue right now, but will do so ASAP.
However, in the interim, here are some other clues:
1. The field of view is about one foot at the intended size of the image.
2. The original has been very heavily photoshopped, but only to bring out weakly saturated colors and small differences in brightness from one point to the next. No geometric distortions were made, nothing was removed, added, composited, etc.
3. This is a small crop out of a much larger image that was discussed in a thread on this forum in just the past few days.
4. You will be astonished when I tell you what it is because the original seems to be so muted and nondescript.
Cheers.
More later.
Tom