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General Hercynite Information |
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 Chemical Formula: |
Fe++Al2O4 | ||
| 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 | |||
| Empirical Formula: |
Fe2+Al2O4 | ||
| Environment: |
Magmatic. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1847 | ||
| Locality: |
Pobezovice, Czechoslovakia. Link to MinDat.org Location Data. | ||
| Name Origin: |
From the old Latin, Hercynia Silva, "Forested Mountains." | ||
| Name Pronunciation: |
Hercynite + Pronunciation  |
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| Synonym: |
ICSD 74611 | ||
| Iron Spinel | |||
| PDF 34-192 | |||
Hercynite Image | |||
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Images:
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Hercynite Crystallography |
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| Cell Dimensions: |
a = 8.136, Z = 8; V = 538.56 Den(Calc)= 4.29 | ||
| Crystal System: |
Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.4597(1), 1.4414(0.42), 1.5691(0.36), | ||
| Forms:
Mouse |
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Crystal Structure:
Mouse |
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Physical Properties of Hercynite |
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| Cleavage: |
{111} Indistinct, {111} Indistinct, {111} Indistinct | ||
| Color: |
Black. | ||
| Density: |
3.95 | ||
| Diaphaneity: |
Opaque | ||
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | ||
| Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. | ||
| Hardness: |
7.5 - Garnet | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
dark green | ||
Optical Properties of Hercynite |
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| 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 |
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| Optical Data: |
Isotropic, n=1.8. | ||
Calculated Properties of Hercynite |
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| Electron Density: |
Bulk Density (Electron Density)=3.82 gm/cc note: Specific Gravity of Hercynite =3.95 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.0069886167 Boson Index = 0.9930113833 |
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| Photoelectric: |
PEHercynite = 10.57 barns/electron U=PEHercynite x rElectron Density= 40.35 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Hercynite is Not Radioactive |
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Hercynite Classification |
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| Dana Class: |
07.02.01.03 (07)Multiple Oxides | ||
| (07.02)(A+ B++)2 X4 Spinel group | |||
| (07.02.01)(Aluminum subgroup) | |||
| 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 | |||
Other Hercynite Information |
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | ||
| 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 Search for Hercynite using: Visit our Advertisers for Hercynite : A Bijoux Google Search for HercyniteAdam's Minerals Google Search for Hercynite Cape Minerals Google Search for Hercynite Dakota Matrix Minerals Google Search for Hercynite Excalibur Mineral Corp. Google Search for Hercynite Exceptional Minerals Google Search for Hercynite John Betts Fine Minerals Search for Hercynite McDougall Minerals Google Search for Hercynite Mineral News Website Link Rock and Mineral Shows Google Search for Hercynite Weinrich Minerals, Inc. Google Search for Hercynite Ask about Hercynite here : Print or Cut-and-Paste your Hercynite Specimen Label here :
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