$250Median
5Sold (12 mo)
$150Last sale
Autunite specimens for sale
4 for sale · $275–$3,500 USD
78 in the gallery
Autunite is a hydrated calcium uranyl phosphate mineral that forms tabular, often prismatic crystals and radiating aggregates. It typically displays a bright yellow to vivid chartreuse color and a waxy to vitreous lustre, sometimes forming needlelike sprays or crusts on matrix rock. When freshly exposed or under UV light, autunite exhibits strong fluorescence, a hallmark feature that makes it especially attractive to collectors.
- Formula
- Ca(UO2)2(PO4)2 · 10-12H2O
- Rarity
- Common
- Stability
- Unstable
- Collector interest
- Very High Interest
- Classification notes
- Phosphate mineral; Uranyl phosphate
Key characteristics
- Crystal system
- tetragonal
- Mohs hardness
- 2–2.5
- Specific gravity
- 3.05–3.2
- Luster
- vitreous, pearly
- Transparency
- transparent, translucent
- Color
- yellow, green
- Streak
- yellow, white
- Cleavage
- perfect
- Fracture
- uneven
- Crystal habit
- tabular, druzy, granular, massive
- Fluorescent: green
- Radioactive
- Light-sensitive
- Classic / historic
Buy Autunite specimens
View all 4Where Autunite is found
Top localities
- Golconda pegmatite field7 specimens
- Margabal Mine4 specimens
- Washington4 specimens
- Bergen2 specimens
- Margnac Mine2 specimens
- Margnac Quarry2 specimens
- Panasqueira Mines2 specimens
- Pennington County2 specimens
- Portugal1 specimen
- Hunan1 specimen
About Autunite
Significant specimens are known from several classic uranium-bearing localities, including the United States, France, and Portugal, with notable occurrences in Brazil and China as well. Crystals can appear as delicate sprays on sandstone or as larger, compact masses in oxidized zones of granite pegmatites, commonly associated with other uranium minerals. Collectors prize autunite for its vivid color, attractive crystal habits, and the dramatic fluorescence that reveals hidden structure under ultraviolet illumination. It is often sought for display and study, illustrating the mineralogy of secondary uranium phosphate systems.
