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24th Oct 2016 23:18 UTCDr.Kyaw Khaing Win

I would like know what the black staff on sapphire crystal?

25th Oct 2016 03:47 UTCIan Nicastro

Any idea where this was collected? This looks like these Sapphire are hosted in Marble/Calcite matrix. I can't really see the black stuff well enough to see the shape. I've seen some Sapphire crystals that had small crystals of black biotite mica on them but those were from a different type of deposit as this, they were hosted in schist, so I don't think that's what you have here. I know Spinel and Rutile can be common inclusions. I've seen some sapphires that had Baddeleyite crystals that grew inside them, but I don't believe that is very common and the Baddeleyite in those sapphires looked a metallic black upon close inspection.

25th Oct 2016 03:52 UTCAntonio Nazario

Could just opaque sapphires due to that not all corundum does not come out gem quality

26th Oct 2016 12:22 UTCPaul Brandes 🌟 Manager

Knowing where this specimen comes from might help in figuring out what the coating is.

From what I can see (blurry photo), maybe some sort of manganese/iron-bearing mineral? :-S

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