Is cobaltoan/calcite radioactive?
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Cobaltoan calcite is not inherently radioactive. It is a variety of calcite that gets its pink to reddish color from the presence of trace amounts of cobalt. Cobalt itself can be radioactive in some isotopic forms, but the amount of cobalt in cobaltoan calcite is generally not sufficient to make the mineral itself radioactive. However, the radioactivity of any mineral can depend on the specific geological conditions and the presence of other radioactive elements in the local environment.