Hercynite Mineral Data

Hercynite Mineral Data +

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General Hercynite Information

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."

Synonym:

ICSD 74611

Iron Spinel

PDF 34-192

Hercynite Image

Images:

Hercynite

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

Hercynite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.4597(1), 1.4414(0.42), 1.5691(0.36),

Forms:

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Forms: [ 1 1 1]

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Crystal Structure:

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Hill R J , American Mineralogist , 69 (1984) p.937-942, X-ray powder diffraction profile refinement of synthetic hercynite, inversion parameter = .163

View Additional jPOWD Structure files for Hercynite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [3] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [4] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [5] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [6] [60] [61] [62] [63] [64] [65] [66] [7] [8] [9]

Physical Properties of Hercynite

Cleavage:

[111] Indistinct, [111] Indistinct, [111] Indistinct

Color:

Black.

Density:

3.95

Diaphaniety:

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:

None.

Luster:

Vitreous (Glassy)

Streak:

dark green

Optical Properties of Hercynite

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

Optical Data:

Isotropic, n=1.8.

Calculated Properties of Hercynite

Electron Density:

r_electron=3.82 gm/cc
note: r_Hercynite=3.95 gm/cc.

Fermion Index

Fermion Index = 0.00698
Boson Index = 0.99302

Photoelectric:

PE_Hercynite= 10.57 barns/electron
U=PE_Hercynite x r_electron= 40.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hercynite is Not Radioactive

Hercynite Classification

Dana Class:

7.2.1.3 (7)Multiple Oxides

(7.2)(A+ B++)2 X4 Spinel group

(7.2.1)(Aluminum subgroup)

7.2.1.1 Spinel MgAl2O4 F d3m 4/m 3 2/m

7.2.1.2 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m

7.2.1.3 Hercynite FeAl2O4 F d3m 4/m 3 2/m

7.2.1.4 Gahnite ZnAl2O4 F d3m 4/m 3 2/m

Strunz Class:

IV/B.01-20 IV - Oxides

IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related), Aluminat-Spinels

IV/B.01 - Spinel group, Spinel - Gahnite series

IV/B.01-10 Spinel MgAl2O4 F d3m 4/m 3 2/m

IV/B.01-20 Hercynite FeAl2O4 F d3m 4/m 3 2/m

IV/B.01-30 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m

IV/B.01-40 Gahnite ZnAl2O4 F d3m 4/m 3 2/m

Other Hercynite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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

Hercynite

Fe++Al2O4
Dana No: 7.2.1.3 Strunz No: IV/B.01-20
Locality:

Notes: