Uranocircite
Uranocircite is a barium uranyl phosphate hydrate and a member of the Autunite Group. It forms thin tetragonal, translucent, greenish yellow to yellow, tabular crystals in clusters and fan-like sub-radial aggregates with a pearly luster, especially on cleavage surfaces. It fluoresces a beautiful yellow-green with UV light. Uranocircite typically occurs as a secondary mineral in the oxidized zone of uranium deposits; in granite pegmatites; and in low-temperature hydrothermal veins.Uranocircite occurs at the Bergen U deposit, Zobes-Bergen District, Vogtland, Saxony, Germany, the type locality, Other notable localities include: Sao Pedro mine, Saucui, Teofilo Ontoni, Minas Gerais, Brazil (as exceptional crystals); Wharf mine, Bald Mountain district, Lawrence Co., and Slim Buttes, Harding Co., South Dakota, USA; Dametice, near Horazdovice, Bohemia, Czech Republic; Wolsendorf, Bavaria, Germany; El Cabril, Fuente-Ovejuna, Cordoba Province, Spain; and many occurrences in the sandstone-hosted uranium deposits of Arizona, New Mexico, Colorado, and Utah, USA. Explore and learn about uranocircite fine mineral specimens online at www.iRocks.com.
- SCH-05
- Uranocircite
- Sao Pedro claim, Malacacheta, Minas Gerais, Brazil
- Thumbnail
- 2.2 x 2.2 x 0.8 cm
- DEN12-31
- Uranocircite
- Sao Pedro Mine, Saucui, Malacacheta District, Teofilo Ontoni, Minas Gerais, Brazil
- Miniature
- 4.9 x 3.2 x 2.4 cm
- MD-24759
- Uranocircite
- Streuberg Quarry, Bergen, Zobes-Bergen District, Vogtland, Saxony, Germany
- Miniature
- 3.5 x 2.2 x 1.4 cm
- MD-69255
- Uranocircite
- Streuberg Quarry, Bergen, Zobes-Bergen District, Vogtland, Saxony, Germany
- Thumbnail
- 2.4 x 2.4 x 1.7 cm
- MD-263833
- Uranocircite
- Streuberg Quarry, Bergen, Zobes-Bergen District, Vogtland, Saxony, Germany
- Miniature
- 3.6 x 2.4 x 0.7 cm
- MD-221049
- Uranocircite
- Sao Pedro claim, Malacacheta, Mucuri valley, Minas Gerais, Southeast Region, Brazil
- Thumbnail
- 2.7 x 2.1 x 1.0 cm
- MD-18993
- Uranocircite
- Streuberg Quarry, Bergen, Zobes-Bergen District, Vogtland, Saxony, Germany
- Toenail
- 3.0 x 2.8 x 1.8 cm
- MD-23134
- Uranocircite
- Streuberg Quarry, Bergen, Zobes-Bergen District, Vogtland, Saxony, Germany
- Miniature
- 4.0 x 2.5 x 2.0 cm
- T06-204
- Uranocircite
- Assuncao Mine, Aldeia Nova, Ferreira de Aves, Viseu District, Portugal
- Miniature
- 3.7 x 2.5 x 2.3 cm
- SF53
- Uranocircite
- San Pedro Mine, Malacacheta, Minas Gerais, Brazil
- Toenail
- 2.9 x 2.9 x 1.8 cm
- T06-27
- Uranocircite
- Sao Pedro Mine, Saucui, Malacacheta District, Teofilo Ontoni, Minas Gerais, Brazil
- Miniature
- 3.7 x 3.5 x 3.1 cm