Ferroselite
A variety of Marcasite Group
What is Ferroselite?
Orthorhombic ferroselite and its isometric polymorph dzharkenite are iron selenides of general formula FeSe2 precipitated under reducing conditions in anoxic environments. They are a source of selenium in the Rocky Mountains where selenium occurrence is associated with Upper Cretaceous shale deposits. In the frame of safety assessment calculations made for deep disposal of high-level radioactive waste, ferroselite and dzharkenite are also considered in geochemical calculations as one of the mineral phases limiting the solubility of Selenium-79.
Ferroselite Market Value Calculator
Estimate the market value of Ferroselite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Ferroselite Localities Map
See where Ferroselite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Steel gray to tin white with rose tint, brass yellow
- Hardness (Mohs)
- 6 - 6.5
- Density
- 7.139 g/cm³
- Streak
- Black
Chemical Properties
- Chemical Formula
- FeSe2
- Elements
- Fe, Se
Identify Ferroselite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you
