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Jacobsite 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.
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manganese minerals spinel magnetite iron oxide group formula mn mg fe2o4 weakly references crystal metamorphism hausmannite galaxite braunite pyrolusite coronadite
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Jacobsite | Category | Oxide minerals Spinel group Spinel structural group | 1.00 | infobox |
| Jacobsite | Cleavage | {111}, probably a parting | 1.00 | infobox |
| Jacobsite | Color | Black to brownish black | 1.00 | infobox |
| Jacobsite | Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) | 1.00 | infobox |
| Jacobsite | Crystal habit | Disseminated to massive, rarely as octahedral crystals | 1.00 | infobox |
| Jacobsite | Crystal system | Isometric | 1.00 | infobox |
| Jacobsite | Diaphaneity | Opaque | 1.00 | infobox |
| Jacobsite | Formula | iron(II,III) manganese oxide, (Mn,Mg)Fe2O4 | 1.00 | infobox |
| Jacobsite | Fracture | Conchoidal | 1.00 | infobox |
| Jacobsite | IMA symbol | Jcb | 1.00 | infobox |
| Jacobsite | Luster | Metallic | 1.00 | infobox |
| Jacobsite | Mohs scale hardness | 5.5–6.5 | 1.00 | infobox |
| Jacobsite | Optical properties | Isotropic | 1.00 | infobox |
| Jacobsite | Other characteristics | weakly magnetic | 1.00 | infobox |
| Jacobsite | Refractive index | ~2.3 | 1.00 | infobox |
| Jacobsite | Space group | Fd3m (no. 227) | 1.00 | infobox |
| Jacobsite | Specific gravity | 4.76 | 1.00 | infobox |
| Jacobsite | Streak | reddish black to brown | 1.00 | infobox |
| Jacobsite | Strunz classification | 4.BB.05 | 1.00 | infobox |
| Jacobsite | Twinning | Spinel law, flattened on {111} or lamellar | 1.00 | infobox |
| Jacobsite | Unit cell | a = 8.457 Å; Z = 8 | 1.00 | infobox |
| Jacobsite | is a | manganese iron oxide mineral | 0.90 | text |
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