Ferroselite is an iron selenide of general formula FeSe2 precipitated under reducing conditions in anoxic environments. It is a source of selenium in the Rocky Mountains where selenium occurrence is associated with Upper Cretaceous shale deposits.
It was first reported in 1955 for an occurrence in the Ust’-Uyuk uranium deposit in Tuva, Siberia.
In the frame of safety assessment calculations made for deep disposal of high-level radioactive waste, ferroselite (and its polymorph dzharkenite) is also considered in geochemical calculations as one of the mineral phases limiting the solubility of Selenium-79.
* Dzharkenite, also of FeSe2 formula, a polymorph of ferroselite
* Dzharkenite (FeSe2) on mindat.org
* Dzharkenite (FeSe2) on webmineral.com
1. ^ a b Ferroselite (FeSe2) on mindat.org