bergenite
Sign in to saveBergenite is a rare uranyl phosphate of the more specific phosphuranylite group. The phosphuranylite-type sheet in bergenite is a new isomer of the group, with the uranyl phosphate tetrahedra varying in an up-up-down, same-same-opposite (uuduudSSOSSO) orientation. All bergenite samples have been found in old mine dump sites. Uranyl minerals are a large constituent of uranium deposits.
Key facts
- Mineral.name
- Bergenite
- Mineral.category
- Uranyl phosphate mineral
- Mineral.image
- Bergenite-144917.jpg
- Mineral.imagesize
- 260px
- Mineral.formula
- Ca2Ba4[(UO2)3O2(PO4)2]3·16(H2O) or (Ba,Ca)2(UO2)3(PO4)2(OH)4·5.5(H2O)
- Mineral.IMAsymbol
- Bgn
- Mineral.strunz
- 8.EC.40
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- P21/c
- Mineral.color
- Yellow to greenish yellow
- Mineral.habit
- Acicular, tabular
- Mineral.mohs
- 2–3
- Mineral.refractive
- nα = 1.660 nβ = 1.700 - 1.710 nγ = 1.722
- Mineral.opticalprop
- Biaxial (-)
- Mineral.birefringence
- δ = 0.062
- Mineral.streak
- yellow white
- Mineral.density
- 4.1
via Wikipedia infobox
Article
7 sectionsContents
- Structure and composition
- Physical properties
- Geologic occurrence and location
- Special characteristics
- See also
- References
- External links
Bergenite is a rare uranyl phosphate of the more specific phosphuranylite group. The phosphuranylite-type sheet in bergenite is a new isomer of the group, with the uranyl phosphate tetrahedra varying in an up-up-down, same-same-opposite (uuduudSSOSSO) orientation. All bergenite samples have been found in old mine dump sites. Uranyl minerals are a large constituent of uranium deposits.
The phosphuranylites are one of the two major groups of the uranyl series, and are the most extensive of the uranium minerals. Uranyl phosphates include 45 different minerals, at least 16 of which belong to the phosphuranylite type topology, including dumontite, vanmeersscheite, upalite, and the most characteristic, phosphuranylite. As explained by Frost et al., the uranyl phosphates display diverse chemical and structural features, which often exhibit the geochemical conditions present during formation.