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Hercynite

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Formula:
Fe2+Al2O4
Colour:
Dark blue-green, yellow, brown
Lustre:
Vitreous
Hardness:
Specific Gravity:
4.39 (Calculated)
Crystal System:
Isometric
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

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of Hercynite

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

Optical Data of Hercynite

Type:
Isotropic

Chemical Properties of Hercynite

Formula:
Fe2+Al2O4

Crystallography of Hercynite

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

Type Occurrence of Hercynite

Synonyms of Hercynite

Other Language Names for Hercynite

German:Hercynit
Simplified Chinese:铁尖晶石
Spanish:Hercynita

Varieties of Hercynite

Chromohercynite

A chromian variety of Hercynite. Compare with Alumochromite.

Chrompicotite

A variety of 'Picotite' (= Hercynite).

Cobaltochrompicotite

A cobaltian variety of Chrompicotite.

Picotite

Mg- and Cr-bearing hercynite.

Relationship of Hercynite to other Species

Member of:
Other Members of this group:
ChromiteFe2+Cr3+2O4
Cochromite(Co,Ni,Fe)(Cr,Al)2O4
CoulsoniteFe2+V3+2O4
CuprospinelCu2+Fe3+2O4
Filipstadite(Sb0.5Fe0.5)Mn2O4
FrankliniteZn2+Fe3+2O4
GahniteZnAl2O4
GalaxiteMn2+Al2O4
JacobsiteMn2+Fe3+2O4
MagnesiochromiteMgCr2O4
MagnesiocoulsoniteMgV2O4
MagnesioferriteMgFe3+2O4
MagnetiteFe2+Fe3+2O4
ManganochromiteMn2+Cr2O4
Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4
Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
SpinelMgAl2O4
TrevoriteNi2+Fe3+2O4
UlvöspinelFe2TiO4
VuorelaineniteMn2+V3+2O4
XieiteFe2+Cr2O4
ZincochromiteZnCr2O4
Forms a series with:

Common Associates

Associated Minerals Based on Photo Data:
Spinel7 photos of Hercynite associated with Spinel on mindat.org.
Magnetite3 photos of Hercynite associated with Magnetite on mindat.org.
Iron3 photos of Hercynite associated with Iron on mindat.org.
Troilite3 photos of Hercynite associated with Troilite on mindat.org.
Chromite3 photos of Hercynite associated with Chromite on mindat.org.
Clinochlore2 photos of Hercynite associated with Clinochlore on mindat.org.
Ilmenorutile1 photo of Hercynite associated with Ilmenorutile on mindat.org.
Rutile1 photo of Hercynite associated with Rutile on mindat.org.
Sillimanite1 photo of Hercynite associated with Sillimanite on mindat.org.
Sodalite1 photo of Hercynite associated with Sodalite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

4.BB.05ChromiteFe2+Cr3+2O4
4.BB.05Cochromite(Co,Ni,Fe)(Cr,Al)2O4
4.BB.05CoulsoniteFe2+V3+2O4
4.BB.05CuprospinelCu2+Fe3+2O4
4.BB.05Filipstadite(Sb0.5Fe0.5)Mn2O4
4.BB.05FrankliniteZn2+Fe3+2O4
4.BB.05GahniteZnAl2O4
4.BB.05GalaxiteMn2+Al2O4
4.BB.05JacobsiteMn2+Fe3+2O4
4.BB.05ManganochromiteMn2+Cr2O4
4.BB.05MagnesiocoulsoniteMgV2O4
4.BB.05MagnesiochromiteMgCr2O4
4.BB.05MagnesioferriteMgFe3+2O4
4.BB.05MagnetiteFe2+Fe3+2O4
4.BB.05Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4
4.BB.05Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
4.BB.05SpinelMgAl2O4
4.BB.05TrevoriteNi2+Fe3+2O4
4.BB.05UlvöspinelFe2TiO4
4.BB.05VuorelaineniteMn2+V3+2O4
4.BB.05ZincochromiteZnCr2O4
4.BB.10HausmanniteMn2+Mn3+2O4
4.BB.10HetaeroliteZnMn2O4
4.BB.10HydrohetaeroliteZnMn2O4 · H2O
4.BB.10IwakiiteMn2+Fe3+2O4
4.BB.15MaghemiteFe3+2O3
4.BB.15TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4
4.BB.20Tegengrenite(Mg,Mn2+)2Sb5+0.5(Mn3+,Si,Ti)0.5O4
4.BB.25XieiteFe2+Cr2O4

Related Minerals - Hey's Chemical Index of Minerals Grouping

7.20.1WüstiteFeO
7.20.2MagnetiteFe2+Fe3+2O4
7.20.3MaghemiteFe3+2O3
7.20.4HematiteFe2O3
7.20.5Goethiteα-Fe3+O(OH)
7.20.6Akaganeite(Fe3+,Ni2+)8(OH,O)16Cl1.25 · nH2O
7.20.7FeroxyhyteFe3+O(OH)
7.20.8Lepidocrociteγ-Fe3+O(OH)
7.20.9FerrihydriteFe3+10O14(OH)2
7.20.10Amakinite(Fe2+,Mg)(OH)2
7.20.11MagnesioferriteMgFe3+2O4
7.20.12MuskoxiteMg7Fe4O13 · 10H2O
7.20.13SrebrodolskiteCa2Fe3+2O5
7.20.15BrownmilleriteCa2(Al,Fe3+)2O5

Related Minerals - Dana Grouping (8th Ed.)

7.2.1.1SpinelMgAl2O4
7.2.1.2GalaxiteMn2+Al2O4
7.2.1.4GahniteZnAl2O4

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.

Hercynite in petrology

An essential component of (items highlighted in red)

References for Hercynite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Jastrzębska Ilona; Szczerba Jacek; Błachowski Artur; Stoch Paweł (2017): Structure and microstructure evolution of hercynite spinel (Fe2+Al2O4) after annealing treatment. Eur. J. Mineral. 29, 1-10.

Internet Links for Hercynite

mindat.org URL:
https://www.mindat.org/min-1875.html
Please feel free to link to this page.
Specimens:
The following Hercynite specimens are currently listed for sale on minfind.com.

Localities for Hercynite

Mineral and/or Locality  
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