Frohbergite Mineral Data

General Frohbergite Information

Chemical Formula:

FeTe2

Composition:

Molecular Weight = 311.05 gm

Iron 17.95 % Fe

Tellurium 82.05 % Te

______

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

PDF 14-419

Frohbergite Image

Images:

Frohbergite

Comments: Irregular black mssses of frohbergite in quartzite matrix.
Location: San Simon Basin (San Simon River; Bowie Chabazite deposit), Bowie area, Cochise Co., Arizona, USA. Scale: Picture Size 2.5 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Frohbergite Crystallography

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 2.81(1), 2.71(0.7), 2.07(0.5),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Tengner S , Zeitschrift fur Anorganische und Allgemeine Chemie , 239 (1938) p.126-132, Uber diselenide und ditelluride von eisen, kobalt und nickel

Physical Properties of Frohbergite

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

Optical Properties of Frohbergite

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	∑ R₁(λ)	∑ R₂(λ)
400 nm	56.70	57.10
420 nm	54.80	56.20
440 nm	52.90	55.30
460 nm	51.90	54.50
480 nm	51.10	53.80
500 nm	50.60	53.10
520 nm	50.10	52.60
540 nm	50.00	52.40
560 nm	50.20	52.50
580 nm	50.70	53.00
600 nm	51.40	53.80
620 nm	52.20	54.50
640 nm	53.00	55.40
660 nm	53.90	56.30
680 nm	55.00	57.40
700 nm	56.20	58.50

**Calculated Relative Intensity Colors of Frohbergite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%
R₁
R₂

Calculated Properties of Frohbergite

Electron Density:

Bulk Density (Electron Density)=6.79 gm/cc
note: Specific Gravity of Frohbergite =8.12 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Frohbergite= 307.26 barns/electron
U=PE_Frohbergite x rElectron Density=2,085.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Frohbergite is Not Radioactive

Frohbergite Classification

Dana Class:

02.12.02.03 (02)Sulfides - Including Selenides and Tellurides

(02.12)where Am Bn Xp, with (m+n):p=1:2

(02.12.02)Marcasite Group (Orthorhombic: Pnnm)

02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m

02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

02.12.02.07 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

02.12.02.08 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

02.12.02.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

02.12.02.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

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

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.10a Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.EB.10a Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.EB.10a Marcasite FeS2 Pnnm 2/m 2/m 2/m

Other Frohbergite Information

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

Search for Frohbergite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Frohbergite :

A Bijoux Google Search for Frohbergite
Adam's Minerals Google Search for Frohbergite
Cape Minerals Google Search for Frohbergite
Dakota Matrix Minerals Google Search for Frohbergite
Excalibur Mineral Corp. Google Search for Frohbergite
Exceptional Minerals Google Search for Frohbergite
John Betts Fine Minerals Search for Frohbergite
McDougall Minerals Google Search for Frohbergite
Mineral News Website Link
Rock and Mineral Shows Google Search for Frohbergite
Weinrich Minerals, Inc. Google Search for Frohbergite

Ask about Frohbergite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Frohbergite

FeTe2
Dana No: 02.12.02.03 Strunz No: 02.EB.10a
Locality:

Notes: