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Frohbergite Mineral Data
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General Frohbergite Information
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 Chemical Formula: |
FeTe2 |
| Composition: |
Molecular Weight = 311.05 gm |
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Iron 17.95 % Fe |
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Tellurium 82.05 % Te |
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______ |
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100.00 % |
| Empirical Formula: |
Fe2+Te2 |
| Environment: |
In hydrothermal ore deposits, rimming chalcopyrite grains, and as inclusions in gold, petzite, or chalcopyrite. |
| IMA Status: |
Valid Species (Pre-IMA) 1947 |
| Locality: |
From the Robb-Montbray and Oranda mines, Quebec. Link to MinDat.org Location Data. |
| Name Origin: |
For Dr. Max Hans Frohberg, mining geologist, Toronto, Canada. |
| Name Pronunciation: |
Frohbergite + Pronunciation  |
| Synonym: |
ICSD 25679 |
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PDF 14-419 |
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Frohbergite Image |
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Images:
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Frohbergite Crystallography
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| Axial Ratios: |
a:b:c =0.8434:1:0.615 |
| Cell Dimensions: |
a = 5.28, b = 6.26, c = 3.85, Z = 2; V = 127.25 Den(Calc)= 8.12 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnnm |
| X Ray Diffraction: |
By Intensity(I/Io): 2.81(1), 2.71(0.7), 2.07(0.5), |
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Physical Properties of Frohbergite
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| Cleavage: |
None |
| Color: |
Silver white, Tin white. |
| Density: |
8.055 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Hardness: |
3-4 - Calcite-Fluorite |
| Luster: |
Metallic |
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Optical Properties of Frohbergite
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| RL Anisotrophism: |
Strong, orange-red to inky blue. |
| RL Color: |
White with bluish or pinkish tint. |
| RL Pleochroism: |
Extremely weak. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Frohbergite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
56.70 |
57.10 |
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| 420 nm |
54.80 |
56.20 |
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| 440 nm |
52.90 |
55.30 |
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| 460 nm |
51.90 |
54.50 |
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| 480 nm |
51.10 |
53.80 |
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| 500 nm |
50.60 |
53.10 |
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| 520 nm |
50.10 |
52.60 |
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| 540 nm |
50.00 |
52.40 |
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| 560 nm |
50.20 |
52.50 |
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| 580 nm |
50.70 |
53.00 |
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| 600 nm |
51.40 |
53.80 |
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| 620 nm |
52.20 |
54.50 |
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| 640 nm |
53.00 |
55.40 |
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| 660 nm |
53.90 |
56.30 |
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| 680 nm |
55.00 |
57.40 |
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| 700 nm |
56.20 |
58.50 |
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Calculated Relative Intensity Colors of Frohbergite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
| R1 |
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| R2 |
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Calculated Properties of Frohbergite
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| Electron Density: |
Bulk Density (Electron Density)=6.79 gm/cc
note: Specific Gravity of Frohbergite =8.12 gm/cc.
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| Fermion Index: |
Fermion Index = 0.06
Boson Index = 0.94 |
| Photoelectric: |
PEFrohbergite = 307.26 barns/electron
U=PEFrohbergite x rElectron Density=2,085.49 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Frohbergite is Not Radioactive |
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Frohbergite Classification
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| Dana Class: |
02.12.02.03 (02)Sulfides - Including Selenides and Tellurides |
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(02.12)where Am Bn Xp, with (m+n):p=1:2 |
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(02.12.02)Marcasite Group (Orthorhombic: Pnnm) |
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02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m |
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02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m |
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02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m |
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02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m |
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02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m |
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02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m |
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02.12.02.07 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m |
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02.12.02.08 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m |
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02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m |
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02.12.02.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m |
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02.12.02.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m |
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02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m |
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02.12.02.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m |
| Strunz Class: |
02.EB.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.E - Metal Sulfides, M:S � 1:2 |
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02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc. |
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02.EB.10a Frohbergite FeTe2 Pnnm 2/m 2/m 2/m |
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02.EB.10a Hastite? CoSe2 Pnnm 2/m 2/m 2/m |
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02.EB.10a Ferroselite FeSe2 Pnnm 2/m 2/m 2/m |
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02.EB.10a Kullerudite NiSe2 Pnnm 2/m 2/m 2/m |
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02.EB.10a Mattagamite CoTe2 Pnnm 2/m 2/m 2/m |
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02.EB.10a Marcasite FeS2 Pnnm 2/m 2/m 2/m |
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Other Frohbergite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Frohbergite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Frohbergite Specimen Label here :
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Frohbergite
FeTe2
Dana No: 02.12.02.03 Strunz No: 02.EB.10a
Locality:
Notes:
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