20 Dollars - Elizabeth II Campo del Cielo Meteorite

Campo del Cielo — "Field of Heaven" — is an iron meteorite field in the Gran Chaco region of Argentina, with individual fragments dating to an impact roughly 4,000 to 5,000 years ago. Spanish conquistadors documented the site in 1576 after learning of it from indigenous peoples who had long used the iron for tools. The fragments are iron-nickel, which is why a sliver could be embedded in a silver coin without structural compromise.

Cook Islands became the dominant issuer of meteorite-insert bullion novelties during the 2010s, working primarily through the Coin Invest Trust distribution network. Whether any actual Campo material in a given example is traceable to a certified lot is a question buyers should put to the seller directly.