Hi,
Please take a look at this gem and let me know if you have ever seen anything like this and maybe suggest how this is possible? It is a tumble polished Peridot nugget and I was hoping someone else had seen something like this before. I was sent two pieces and both have this coloring inside along it’s crystal structure.
Any comments are welcome!
Kathy
https://instagram.com/p/4ZygYkAzaV/?taken-by=kathysinbox
Looks like the link didn’t show up, here is the attachment to the Peridot
Kathy,
I am probably not the most educated in precise terminology however I believe this is as you described a fissure/crack whereby an “oil on water” type phenomenon is being demonstrated possibly due to water or liquid inclusion creating a similar effect to an opal (ie. differential penetration and return of light producing rainbow colours). I have seen this in quite a few mineral specimens and quite often in the quartz family. I don’t believe this would be rare or desirable in peridot unless it was in a specimen in such a way to render it uniquely collectable. The feature would reduce likelihood of successful cutting/faceting as it could cleave along that plane.
I hope the above was of some help.
All the best,
Edward.