Rock found in a river in Lithuania.
The regular shapes of the patterns in the rock suggest that they are most likely fragments of fossils. The rock is very likely a sedimentary rock formed in a shallow sea. The hollow rings are similar to the stalks of Echinoderms. If you look more closely upstream you probably will be able to find more of them. Drape a couple or two of hydrochloric acid droplets on the rock, if the rock is composed of Limestone-which most of the rocks containing fossils are composed of-it should give off minute bubbles of carbon dioxide gas.
- Consult a paleontologist
Dioptase and Duftite on Calcite
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