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franklinite
Sign in to saveFranklinite is an oxide mineral belonging to the normal spinel subgroup's iron (Fe) series, with the formula ZnFe3+2O4.
Key facts
- Mineral.name
- Franklinite
- Mineral.image
- Franklinite-Willemite-Zincite-103826.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- Franklinite (black) with Zincite (red)
- Mineral.category
- Oxide minerals Spinel group Spinel structural group
- Mineral.formula
- ZnFe2O4
- Mineral.IMAsymbol
- Frk
- Mineral.strunz
- 4.BB.05
- Mineral.system
- Cubic
- Mineral.class
- Hexoctahedral (mm) H-M symbol: (4/m 2/m)
- Mineral.symmetry
- Fdm
- Mineral.color
- black
- Mineral.habit
- octahedral
- Mineral.cleavage
- None; indistinct octahedral parting in four directions
- Mineral.fracture
- irregular/uneven, conchoidal
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 5.5–6
- Mineral.luster
- metallic, often dull
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Franklinite is an oxide mineral belonging to the normal spinel subgroup's iron (Fe) series, with the formula ZnFe3+2O4.
As with another spinel member magnetite, both ferrous (2+) and ferric (3+) iron may be present in Franklinite samples. Divalent iron and/or manganese (Mn) may commonly accompany zinc (Zn) and trivalent manganese may substitute for some ferric iron.