Tags: Chemical Substance, Mineral.
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.
