Category Oxide mineral Dana classification 7.2.13.1 | Formula
(repeating unit) (Mn,Mg)(Sb0.5Fe0.5)O4 Crystal system Isometric | |
Strunz classification 4.BB.05 (10 ed)
4/B.05-70 (8 ed) Crystal class Hexoctahedral (m3m)
H–M Symbol (4/m 3 2/m) | ||
Filipstadite is a very rare mineral of the spinel group, with the formula (Mn,Mg)(Sb5+0.5Fe3+0.5)O4. It is isometric, although it was previously though to be orthorhombic. When compared to a typical spinel, both the octahedral and tetrahedral sites are split due to cation ordering. Filipstadite is chemically close to melanostibite. The mineral comes from Långban, Sweden, a manganese skarn deposit famous for many rare minerals.
Occurrence and association
In the metamorphic Fe-Mn ore bodies of the Långban-type filipstadite associates with native antimony, calcite, native copper, forsterite, hausmannite, hedyphane, ingersonite, jacobsite, phlogopite, and svabite.
References
Filipstadite Wikipedia(Text) CC BY-SA