Mineralogy Database

Hercynite Mineral Data

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General Hercynite Information

Help on Chemical  Formula: Chemical Formula: Fe++Al2O4
Help on Composition: Composition: Molecular Weight = 173.81 gm
   Aluminum  31.05 %  Al   58.66 % Al2O3
   Iron      32.13 %  Fe   41.34 % FeO
   Oxygen    36.82 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Al2O4
Help on Environment: Environment: Magmatic.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1847
Help on Locality: Locality: Pobezovice, Czechoslovakia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the old Latin, Hercynia Silva, "Forested Mountains."
Help on Name Pronunciation: Name Pronunciation: Hercynite + Pronunciation Say HERCYNITE
Help on Synonym: Synonym: ICSD 74611
  Iron Spinel
  PDF 34-192
 

Hercynite Image

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  Hercynite

Comments: Brownish black granular hercynite.
Location: Nacetin, Severocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hercynite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.136, Z = 8; V = 538.56 Den(Calc)= 4.29
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.4597(1), 1.4414(0.42), 1.5691(0.36),
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Physical Properties of Hercynite

Help on Cleavage: Cleavage: {111} Indistinct, {111} Indistinct, {111} Indistinct
Help on Color: Color: Black.
Help on Density: Density: 3.95
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: dark green
 

Optical Properties of Hercynite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1865,KPDmeas= 0.2025,KC= 0.1991
Ncalc = 1.79 - 1.85
Help on Optical Data: Optical Data: Isotropic, n=1.8.
 

Calculated Properties of Hercynite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Hercynite =3.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0069886167
Boson Index = 0.9930113833
Help on Photoelectric: Photoelectric: PEHercynite = 10.57 barns/electron
U=PEHercynite x rElectron Density= 40.35 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hercynite is Not Radioactive
 

Hercynite Classification

Help on  Dana Class: Dana Class: 07.02.01.03 (07)Multiple Oxides
  (07.02)(A+ B++)2 X4 Spinel group
  (07.02.01)(Aluminum subgroup)
 
07.02.01.01 Spinel MgAl2O4 F d3m 4/m 3 2/m
 
07.02.01.02 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m
 
07.02.01.03 Hercynite FeAl2O4 F d3m 4/m 3 2/m
 
07.02.01.04 Gahnite ZnAl2O4 F d3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 04.BB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.B - Metal:Oxygen = 3:4 and similar
  04.BB -With only medium-sized cations
 
04.BB.05 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Filipstadite (Mn,Mg)4SbFeO8 pseudo ISO 2/m 2/m 2/m
 
04.BB.05 Magnetite FeFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Gahnite ZnAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Chromite FeCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m
 
04.BB.05 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Coulsonite FeV2O4 F d3m 4/m 3 2/m
 
04.BB.05 Hercynite FeAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m
 
04.BB.05 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Qandilite (Mg,Fe)2(Ti,Fe,Al)O4 F d3m 4/m 3 2/m
 
04.BB.05 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Spinel MgAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Ulvospinel TiFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Trevorite NiFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Vuorelainenite (Mn,Fe)(V,Cr)2O4 F d3m 4/m 3 2/m
 

Other Hercynite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Hercynite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - University of Colorado - Mineral Structure Data
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Hercynite Specimen Label here :

Hercynite

Fe++Al2O4
Dana No: 07.02.01.03 Strunz No: 04.BB.05
Locality:

 

Notes:

 

 
   
 


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