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Mineralpedia Details for Autunite

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Autunite

Autunite

Named for the type locality near Autun at Saint-Synphorien-de-Marmagne in Burgundy, France. Autunite is an uncommon secondary mineral that results from uranium-bearing minerals in oxidizing conditions and in hydrothermal veins and granite pegmatites, and other geologic settings. It is a widespread mineral that can be found as excellent specimens in France, Portugal, Italy, Germany, England, the United States, Brazil, and Australia, among several other localities. Autunite is highly radioactive and will fluoresce a yellow-green under ultraviolet light. It will also dehydrate upon exposure to air.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/autunite.pdf

Formula
Ca(UO2)2(PO4)2ยท10-12H2
Crystal System
Tetragonal 
Crystal Habit
Tabular, Micaceous, Foliated 
Cleavage
Perfect, Poor, Poor 
Luster
Vitreous - Pearly 
Color
yellow, pale yellow, lemon yellow, greenish yellow, pale green 
Streak
pale yellow 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Uneven 
Hardness
2-2.5 
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Autunite from Daybreak mine, Mt. Spokane, Spokane Co., Washinton, United States

Autunite
            from Daybreak mine, Mt. Spokane, Spokane Co., Washinton, United States

Nice piece from this classic and premier locality featuring naturally fluorescent greenish yellow, thin platy Autunite blades to 2cm.

Vibrant yellow-green square-tabular crystals to 9mm.

Platy, yellow-green Autunite crystals to 2cm.

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Autunite from Ranger Mine, Northern Territory, Australia

Autunite
            from Ranger Mine, Northern Territory, Australia

Yellow, slightly green tabular, platy crystal aggregated to 4mm.

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Autunite from Apex mine, Lander Co., Nevada, United States

Autunite
            from Apex mine, Lander Co., Nevada, United States

Crystals to 3mm.

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Autunite from Saint-Symphorien, near Autun, Saône-et-Loire, Burgundy, France

Autunite
            from Saint-Symphorien, near Autun, Saône-et-Loire, Burgundy, France

Superb, well-preserved specimen The crystals are bright yellow to 5mm.

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Autunite from Mitchell Co., North Carolina, United States

Autunite
            from Mitchell Co., North Carolina, United States

No specific locality on this specimen, but I am sure someone can come close. It's a large plate with good yellow crystals of Autunite to 1mm. It is probably Chalk Mountain.

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Autunite from Merrivale quarry, Dartmoor, Devon, England

Autunite
            from Merrivale quarry, Dartmoor, Devon, England
Special Info
Fluorescent, Radioactive!!

Micro bright yellow thin platy crystals on Cornubian batholith granite.

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