Metallic inclusions of the very rare Fe-Ni antimonide seinajokite from the TL in Seinajoki, Finland. One side of the specimen is polished because of the analysis. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Seinäjokite
Seinäjokite is an IMA-recognized mineral species in the sulfide class, with the chemical formula FeSb₂.
It crystallizes in the orthorhombic crystal system (space group Pnnm). It is a member of the Löllingite structural group.
Key properties: specific gravity 7.938; Metallic luster.
IMA symbol Sjk, IMA status: approved, named in 1976.
Found in an antimony deposit, replacing antimony (Seinäjoki deposit, Finland).
It is found associated with Antimony, antimonian westerveldite, breithauptite, altaite (Seinäjoki deposit, Finland).
The name refers to the occurrence at Seinäjoki, Finland.