This is an excellent specimen of meta-autunite from the renowned uranium-producing Daybreak Mine in Washington. The specimen exhibits the characteristic yellow-green hue, with foliated, platy orthorhombic crystals covering both sides, the largest reaching 5 mm. Mined in the 1950s and 60s, specimens from this active period are now quite rare, especially those as dense and colourful as this one.
Known for its notable intense neon green fluorescence under UV light, this autunite specimen is particularly delicate. Its structure, while stable if carefully handled, feels flexible like thick leather and may easily break if improperly held. As a classic U.S. locality for radioactive minerals, the Daybreak Mine is the type locality for meta-autunite, adding historical and mineralogical significance to this already stunning display piece.
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