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Hercynite

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Formula:
Fe2+Al2O4
System:
Isometric
Colour:
Dark blue-green, yellow, ...
Hardness:
Member of:
Name:
Named in 1839 by František Xaver Maximilian Zippe from the Latin name for the Bohemian Forest, Silva Hercynia, where the species was first found.

Classification of Hercynite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
7.2.1.3

7 : MULTIPLE OXIDES
2 : AB2X4
7.20.14

7 : Oxides and Hydroxides
20 : Oxides of Fe
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Type Occurrence of Hercynite

Year of Discovery:
1847

Physical Properties of Hercynite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Dark blue-green, yellow, brown
Streak:
Dark greyish green to dark green
Hardness (Mohs):
Tenacity:
Brittle
Fracture:
Conchoidal
Density:
4.39 g/cm3 (Calculated)

Crystallography of Hercynite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 8.119Å
Unit Cell Volume:
V 535.19 ų (Calculated from Unit Cell)
Morphology:
Crystals usually octahedral.
Twinning:
Common on {111}, (spinel law).

Optical Data of Hercynite

Type:
Isotropic

Chemical Properties of Hercynite

Formula:
Fe2+Al2O4
Essential elements:
All elements listed in formula:

Relationship of Hercynite to other Species

Series:
Forms a series with Spinel (see here)
Forms a series with Gahnite (see here)
Forms a series with Chromite (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
JacobsiteMn2+Fe23+O4
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.05JacobsiteMn2+Fe23+O4
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
7.20.1WüstiteFeO
7.20.2MagnetiteFe2+Fe23+O4
7.20.3MaghemiteFe23+O3
7.20.4HematiteFe2O3
7.20.5Goethiteα-Fe3+O(OH)
7.20.6Akaganeiteβ-Fe3+O(OH,Cl)
7.20.7FeroxyhyteFe3+O(OH)
7.20.8Lepidocrociteγ-Fe3+O(OH)
7.20.9FerrihydriteFe103+O14(OH)2
7.20.10Amakinite(Fe2+,Mg)(OH)2
7.20.11MagnesioferriteMgFe23+O4
7.20.12MuskoxiteMg7Fe4O13 · 10H2O
7.20.13SrebrodolskiteCa2Fe23+O5
7.20.15BrownmilleriteCa2(Al,Fe3+)2O5

Other Names for Hercynite

Name in Other Languages:
German:Hercynit
Simplified Chinese:铁尖晶石
Spanish:Hercynita

Other Information

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 Hercynite

Reference List:
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: 689-697.

Neues Jahrbuch für Mineralogie, Abhandlungen: 115: 120-122.

European Journal of Mineralogy: 6: 39-51.

Andreozzi, G.B. and Lucchesi, S. (2002) Intersite distribution of Fe 2+ and Mg in the spinel (sensu-stricto)-hercynite series by single-crystal X-ray diffraction. American Mineralogist: 87: 1113-1120.

Internet Links for Hercynite

Localities for Hercynite

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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