Thulium(III) oxide

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Science and technology

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What Wikipedia says

Thulium(III) oxide is a pale green crystalline compound, with the formula Tm2O3. It was first isolated in 1879, from an impure sample of erbia, by Swedish chemist Per Teodor Cleve, who named it thulia.

Excerpt from the Wikipedia article “Thulium(III) oxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Materialscientist at English Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.