Filipstadite
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CategoryOxide mineral
Formula(Mn,Mg)(Sb5+0.5Fe3+0.5)O4
Strunz classification4.BB.05 (10 ed)
4/B.05-70 (8 ed)
4/B.05-70 (8 ed)
| Filipstadite | |
|---|---|
| General | |
| Category | Oxide mineral |
| Formula | (Mn,Mg)(Sb5+0.5Fe3+0.5)O4 |
| IMA symbol | Fps[1] |
| Strunz classification | 4.BB.05 (10 ed) 4/B.05-70 (8 ed) |
| Dana classification | 7.2.13.1 |
| Crystal system | Isometric |
| Crystal class | Hexoctahedral (m3m) H–M Symbol (4/m 3 2/m) |
| Space group | Fd3m |
| Unit cell | a = 25.93 Å (approximated); Z = 216 |
| Identification | |
| Color | Black |
| Crystal habit | modified (pseudo)octahedra |
| Twinning | Poor |
| Fracture | Conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 6-6.5 |
| Luster | Metallic |
| Streak | Brown |
| Density | 4.9 (calculated) |
| Optical properties | Biaxal |
| References | [2][3][4] |
Filipstadite is a very rare mineral[4] of the spinel group, with the formula (Mn,Mg)(Sb5+0.5Fe3+0.5)O4.[5] It is isometric,[3] although it was previously thought to be orthorhombic. When compared to a typical spinel, both the octahedral and tetrahedral sites are split due to cation ordering.[3] Filipstadite is chemically close to melanostibite.[6] The mineral comes from Långban, Sweden, a manganese skarn deposit famous for many rare minerals.[7]