mineral
Autunite
Hydrated calcium uranyl phosphate silicate, Ca(UO2)2(PO4)2·10-12H2O
AI-generated identification · may be incorrectHardness of 2-2.5 on the Mohs scale, vibrant yellow to greenish-yellow color, pearly to sub-adamantine luster, and exhibits strong bright yellow-green fluorescence under UV light.
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Physical properties
Hardness of 2-2.5 on the Mohs scale, vibrant yellow to greenish-yellow color, pearly to sub-adamantine luster, and exhibits strong bright yellow-green fluorescence under UV light.
Formation & geological history
Forms as a secondary mineral in the oxidized zones of uranium-bearing hydrothermal veins and pegmatites.
Uses & applications
Primarily collected by mineral enthusiasts and used as an ore of uranium, though caution is required due to radioactivity.
Geological facts
Autunite is radioactive and will glow a bright neon green under ultraviolet light because of its uranium content.
Field identification & locations
Identified by its distinct lemon-yellow color, micaceous tabular crystals, and strong green UV fluorescence; found globally in uranium deposits.
