Marcasite structure
From apm
Marcasite structure: (ortorhombic with simple unit cell)
- FeS2 Marcasite – Mohs 6.0-6.5 – 4.88g/ccm – compadred to pyrite: less chemically stable, smaller unit cell, lower crystal structure symmetry
- FeSe2 Ferroselite – Mohs 6.0-6.5 – 7.2g/ccm – Fe substitutable by Ni (Kullerudit), Cu (Petříčekit)
- FeTe2 Frohbergit – Fe substitutable by Co (Mattagamit) – – FePo2 ?? (highly radioactive)
Marcasite structure (other group):
- FeP2 Zuktamururite – Mohs ??
- FeAs2 Loellingite – Mohs 5.0-5.5 – 7.1-7.5g/ccm
- FeSb2 (materialsproject)
- (FeBi2 – cannot be produced via thermodynamic means it seems – highly immiscible when molten – [1])
- Rammelsbergite (NiAs2) – has two polymorps: (Krutovit cubic) (Pararammelsbergit – orthorhombic)
- Safflorit (CoAs2), Omeiite (OsAs2), Anduoite (RuAs2)
- Nisbit (NiSb2)
