Yeah trying to remember gen chem flame test, Mn might be right... Maybe something with Cu? 🤔

Would need to see an emission spectrum to be sure.. Or I guess scrape off some and have it sent for ICP-MS if you're really curious..

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I'm definitely not curious enough to go scratching out samples. It was a gift & it's very pretty.

I do have a cheap Geiger counter, though. I don't know if it's sensitive enough for this small of an area, but it picks up on K-spar granite just fine. If I get a chance over the weekend, I'll dig it out of the ol' apocalypse box and report back.