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A set of two of the famous Corocoro "disco ball" floaters. One Native Copper pseudomorph after Aragonite and one original Aragonite ; which is a fun way to demonstrate the before and after state of these unique pseudomorphs. Sets like this are not often offered for sale, and if they are then at least for 100$ (see here on Minfind). We found a dozen of these ourselves in Corocoro in 2009 in almost 4.000 meter altitude). It's big fun to find them yourself, and it's even more fun to play with them and explain them to friends ;)
The Copper to Aragonite pseudomorph really feels heavy in your hand, and the original Aragonite is almost as light as paper.
Corocoro, Pacajes Province, La Paz Department, Bolivia
Both floaters have a diameter of 1,6-1,7 cm