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Jacobsite

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Formula:
Mn2+Fe23+O4
System:
Isometric
Colour:
Black, grey in reflected ...
Lustre:
Sub-Metallic
Hardness:
5½ - 6½
Member of:
Name:
Named in 1869 by Augustin Alexis Damour for the type locality of Jakobsberg, Sweden.

Classification of Jacobsite

Approved
4.BB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
7.2.2.2

7 : MULTIPLE OXIDES
2 : AB2X4
7.19.3

7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe
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First Recorded Occurrence of Jacobsite

Year of Discovery:
1869

Physical Properties of Jacobsite

Sub-Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Black, grey in reflected light
Streak:
Reddish black
Hardness (Mohs):
5½ - 6½
Tenacity:
Brittle
Density:
4.76 g/cm3 (Measured)    5.03 g/cm3 (Calculated)

Crystallography of Jacobsite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 8.457Å
Unit Cell Volume:
V 604.85 ų (Calculated from Unit Cell)
Morphology:
Octahedral. Rarely found as crystals. Massive, granular.

Crystallographic forms of Jacobsite

Crystal Atlas:
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Jacobsite no.1 - Goldschmidt (1913-1926)
Jacobsite no.6 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Transparency
Opaque | Translucent | Transparent

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Epitaxial Relationships of Jacobsite

Epitaxial Minerals:
HausmanniteMn2+Mn23+O4
Epitaxi Comments:
Oriented intergrowths (Vredenbergite).

Optical Data of Jacobsite

Type:
Isotropic
Type:
Isotropic
Colour in reflected light:
Grey-white with olive tint
Internal Reflections:
Brown

Chemical Properties of Jacobsite

Formula:
Mn2+Fe23+O4
Essential elements:
All elements listed in formula:
Common Impurities:
Zn

Relationship of Jacobsite to other Species

Series:
Forms a series with Magnetite (see here)
Member of:
Other Members of Group:
Ceylonite
ChromiteFe2+Cr23+O4
Cochromite(Co,Ni,Fe)(Cr,Al)2O4
CoulsoniteFe2+V23+O4
CuprospinelCu2+Fe23+O4
Filipstadite(Sb0.5Fe0.5)Mn2O4
FrankliniteZn2+Fe23+O4
GahniteZnAl2O4
Galaxite(Mn,Fe,Mg)(Al,Fe)2O4
HercyniteFe2+Al2O4
MagnesiochromiteMg(Cr,Al,Fe)2O4
MagnesiocoulsoniteMgV2O4
MagnesioferriteMgFe23+O4
MagnetiteFe2+Fe23+O4
Manganochromite(Mn,Fe)(Cr,V)2O4
Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4
Qandilite(Mg,Fe)2(Ti,Fe,Al)O4
SpinelMgAl2O4
TrevoriteNi2+Fe23+O4
UlvöspinelFe2TiO4
Vuorelainenite(Mn,Fe)(V,Cr)2O4
ZincochromiteZnCr2O4
4.BB.05ChromiteFe2+Cr23+O4
4.BB.05Cochromite(Co,Ni,Fe)(Cr,Al)2O4
4.BB.05CoulsoniteFe2+V23+O4
4.BB.05CuprospinelCu2+Fe23+O4
4.BB.05Filipstadite(Sb0.5Fe0.5)Mn2O4
4.BB.05FrankliniteZn2+Fe23+O4
4.BB.05GahniteZnAl2O4
4.BB.05Galaxite(Mn,Fe,Mg)(Al,Fe)2O4
4.BB.05HercyniteFe2+Al2O4
4.BB.05Manganochromite(Mn,Fe)(Cr,V)2O4
4.BB.05MagnesiocoulsoniteMgV2O4
4.BB.05MagnesiochromiteMg(Cr,Al,Fe)2O4
4.BB.05MagnesioferriteMgFe23+O4
4.BB.05MagnetiteFe2+Fe23+O4
4.BB.05Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4
4.BB.05Qandilite(Mg,Fe)2(Ti,Fe,Al)O4
4.BB.05SpinelMgAl2O4
4.BB.05TrevoriteNi2+Fe23+O4
4.BB.05UlvöspinelFe2TiO4
4.BB.05Vuorelainenite(Mn,Fe)(V,Cr)2O4
4.BB.05ZincochromiteZnCr2O4
4.BB.10HausmanniteMn2+Mn23+O4
4.BB.10HetaeroliteZnMn2O4
4.BB.10HydrohetaeroliteZnMn2O4 · H2O
4.BB.10IwakiiteMn2+Fe23+O4
4.BB.15MaghemiteFe23+O3
4.BB.15TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4
4.BB.20Tegengrenite(Mg,Mn2+)2Sb5+0.5(Mn3+,Si,Ti)0.5O4
4.BB.25XieiteFe2+Cr2O4
7.19.1BixbyiteMn23+O3
7.19.2JangguniteMn5-x(Mn,Fe)1+xO8(OH)6
7.19.4Vernadite(Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2O
7.19.5Galaxite(Mn,Fe,Mg)(Al,Fe)2O4
7.19.6Filipstadite(Sb0.5Fe0.5)Mn2O4
7.19.7Manganochromite(Mn,Fe)(Cr,V)2O4
7.19.8ZenzénitePb3(Fe,Mn)4Mn3O13

Other Names for Jacobsite

Name in Other Languages:
Simplified Chinese:黑镁铁锰矿
锰铁矿
Spanish:Jacobsita

Other Information

Magnetism:
Diamagnetic
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Jacobsite

Reference List:
Damour (1869), C.R.: 69: 168.

Flink (1886), Ak. Stockholm Bh.: 12(2): 2, 20.

Fermor (1909), Geological Survey of India, Rcords: 37: 199.

Johansson (1928), Zs. Kr.: 68: 107.

Orcel and Pavlovitch (1932), Bull. soc. min.: 54: 108.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume I: 698-707.

Journal of Physics and Chemistry of Solids (1962): 23: 1661.

Essene, E.J. and Peacor, D.R. (1983) Crystal chemistry and petrology of coexisting galaxite and jacobsite and other spinel solutions and solvi. American Mineralogist: 68: 449-455.

Internet Links for Jacobsite

Specimens:
The following Jacobsite specimens are currently listed for sale on minfind.com.

Localities for Jacobsite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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