They certainly exist, but the color is not stable. It can also be produced by irradiation similar to the greens and purples, though I think it is more scarce. The color can actually range all the way to aquamarine-like blue without these strong green tones. I have seen speculation that it's a higher oxidation state of manganese that produces it, but that's really just speculation. Edit: here's a particularly nice picture of one from Salman Khan of Arsaa Gems: https://www.flickr.com/photos/koheqaf/4724218282/ No doubt he's using an LED flashlight which will help push the blue end of the color but still.
Joined: Wed Jan 23, 2013 5:29 pm Posts: 1047 Location: Paris
OK, so I think I'll skip my turn on this one. If the color goes away as soon as it sees a ray of sun... Already, there is a noticeable color difference between the catalogue picture and the one of the lab report ! Thanks Stephen.
I love this comment on the report, in the "additional grading characteristics" : "Color grade : Good color quality"
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
I bought a blue spodumene from Jason Brim some years back. He sent it in a black zip lock. It remains there in the safe, checked periodically: still blue, as of about a year ago.
I got one from another source which came in a transparent gem jar. Today totally colorless.
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