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3D3DRbMnF3 crystal.
I don't even know what you'd call this other than by its chemical name: It's a pretty pinkish little bar of what is probably a single crystal, crudely cut and roughly surfaced, but not polished to any significant degree. It came from a batch of old samples and research materials being discarded by Ethan's university. The fact that it's translucent and colored makes me think it might be intended as some kind of laser material, whether it worked or not I have no idea. The fact that they threw it away may or may not indicate something about its usefulness.
Source: Ethan Currens
Contributor: Ethan Currens
Acquired: 16 March, 2007
Text Updated: 14 October, 2008
Price: Donated
Size: 1"
Composition: RbMnF3