2 SEM images of gemstones: emerald and ruby (Electron Miscroscope with Secondary Electron detector, (which "takes picture" of surface layer (~0.5 um) both the elemental composition and relief)).
Dendrites - it is clear (not me, but in general), what creates other patterns?
* trace elements? - the stones are very clean (<1000 ppm) and well processed
* relief? - OK and next question: why such relief?
* electrostatics? - definitely not. Electrostatics in dielectrics looks like distortion at the top of ruby photo.
* anything else?
I would be very grateful for any ideas! Or any links.
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