Magnetite


Composition: Fe2+Fe3+2O4
Crystal System : Cubic
Colours: Iron-black, black
Lustre : Metallic, greasy, dull
Hardness (H) : 5.5-6.5
Specific Gravity (S.G) : 5.175

Distribution

Rare. Sparse, but widely distributed, as an accessory mineral in feldspathic sandstone ("pseudo-aplite").

Occurrence

  • Country Rock

Paragenetic and General Notes

Pinch and Wilson (1977) comment that magnetite is "a mineral of the country rock; sometimes in octahedral crystals replaced by hematite".

The following minerals are reported to form pseudomorphs after magnetite:  hematite (rare).