Ruby in Marble
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This work is licensed under a Creative Commons Attribution 4.0 International License.Rubies in marble, also referred to as marble-hosted rubies, are considered higher quality compared to rubies formed in basaltic rocks. This is because the low iron content in marble allows rubies to develop a more intense red color. Ruby has the chemical formula Al₂O₃, while marble commonly has the formula CaCO₃ or CaMg(CO₃)₂. Under ultraviolet light, ruby fluoresces a bright red-pink color. This particular ruby is unpolished.
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Science History Institute. Ruby in Marble. Photograph, 2025. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/rrdmfvh.
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