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Powellite

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Powellite is a calcium molybdate mineral with the chemical formula CaMoO₄. It occurs naturally in hydrothermal ore deposits and has a tetragonal crystal structure. Powellite fluoresces a bright yellow under short-wave ultraviolet light.

This particular specimen is peach-hued and one of the largest examples of a powellite single crystal ever found.

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  • 10.7 cm W x 14.6 cm H x 9.5 cm L
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  • Courtesy of Science History Institute

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Science History Institute. Powellite. Photograph, 2025. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/mo2cc13.

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The Science History Institute recognizes there are materials in our collections that may be offensive or harmful, containing racist, sexist, Eurocentric, ableist, or homophobic language or depictions. The history of science is not exempt from beliefs or practices harmful to traditionally marginalized groups. The Institute is engaged in ongoing efforts to responsibly present and address the evidence of oppression and injustice inextricable from the history of science. If you would like to learn more about our ongoing efforts or if you encounter harmful, inaccurate, or insufficient descriptions, please contact us at digital@sciencehistory.org.