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Afghanite

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Afghanite is a hydrous sodium, calcium, potassium, sulfate, chloride, carbonate, alumino-silicate mineral. Its chemical formula is written as (Na,Ca)₈(Si,Al)₁₂O₂₄(SO₄,Cl)₂. It is a feldspathoid of the cancrinite group and typically occurs with sodalite group minerals. Afghanite forms blue to colorless, typically massive crystals in the trigonal crystal system. It was discovered in 1968 in the Lapis-lazuli Mine in Afghanistan.

Afghanite fluoresces under long-wave ultraviolet light.

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Science History Institute. Afghanite. Photograph, 2025. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/ui15pi8.

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