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Sign in to saveJacobsite is a manganese iron oxide mineral. It is in the spinel group and forms a solid solution series with magnetite. The chemical formula is (Mn,Mg)Fe2O4 or with oxidation states and substitutions: (Mn2+,Fe2+,Mg)(Fe3+,Mn3+)2O4. thumb|left|Jacobsite, N'Chwaning Mines, Kuruman, Kalahari manganese fields, [[Northern Cape Province, South Africa. Size 3.8 x 3.5 x 3.2 cm]]
Key facts
- Mineral.name
- Jacobsite
- Mineral.category
- Oxide minerals Spinel group Spinel structural group
- Mineral.image
- Jacobsite-cktsr-15a.jpg
- Mineral.imagesize
- 260px
- Mineral.formula
- iron(II,III) manganese oxide, (Mn,Mg)Fe2O4
- Mineral.IMAsymbol
- Jcb
- Mineral.strunz
- 4.BB.05
- Mineral.system
- Isometric
- Mineral.class
- Hexoctahedral (mm) H-M symbol: (4/m 2/m)
- Mineral.symmetry
- Fdm (no. 227)
- Mineral.unit cell
- a = 8.457 Å; Z = 8
- Mineral.color
- Black to brownish black
- Mineral.habit
- Disseminated to massive, rarely as octahedral crystals
- Mineral.twinning
- Spinel law, flattened on {111} or lamellar
- Mineral.cleavage
- {111}, probably a parting
- Mineral.fracture
- Conchoidal
- Mineral.mohs
- 5.5–6.5
- Mineral.luster
- Metallic
via Wikipedia infobox
Wikidata facts
- Subclass of
- oxyspinel group
- Image
- Jacobsite-cktsr-15a.jpg
Show 7 more facts
- Nickel-Strunz 9th edition (updated 2009)
- 4.BB.05
- IMA Mineral Symbol
- Jcb
- chemical formula
- Mn²⁺Fe³⁺₂O₄
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.BB.05
- Commons category
- Jacobsite
- crystal system
- cubic crystal system
- Strunz 8th edition (series ID, updated)
- IV/B.01b
Sources (1)
via Wikidata · CC0