Peruvian turquoise in Costa Rica?

Seeing these in the street market. Seller is from Peru and says he got them from the Arequipa mine in Peru. US$20 each.

Any good or complete fake?

He will close by 9pm which is in 5 hours. I like them a lot.

Edit: cannot find turquoise from any Arequipa related mine. Most mines in that area are copper mines tough.

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Googled a bit, and believe it’s chrysocolla. Will now enjoy the beach.

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The main oxide copper minerals are brochantite, chrysocolla, malachite and copper “pitch.” Chalcocite and covellite are the most important secondary enrichment copper sulfide minerals. Chalcopyrite and molybdenite are the dominant primary sulfides.[4]

https://en.wikipedia.org/wiki/Cerro_Verde_mine

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Thanks a lot for the explanation. Not only turquoise is beautiful.

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