Ekanite

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What Wikipedia says

Ekanite is an uncommon silicate mineral with chemical formula Ca2ThSi8O20 or (Ca,Fe,Pb)2(Th,U)Si8O20. It is a member of the steacyite group. It is among the few gemstones that are naturally radioactive. Most ekanite is mined in Sri Lanka, although deposits also occur in Russia and North America.

Excerpt from the Wikipedia article “Ekanite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Geni, CC BY-SA 4.0, via Wikimedia Commons.