Mattagamite Mineral Data

Mattagamite Mineral Data +

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General Mattagamite Information

Chemical Formula:

CoTe2

Composition:

Molecular Weight = 314.13 gm

Cobalt 18.76 % Co

Tellurium 81.24 % Te

______

100.00 %

Empirical Formula:

CoTe₂

Environment:

In a small telluride zone in a massive zinc-rich stratiform deposit in Archaen volcanics.

IMA Status:

Approved IMA 1973

Locality:

Mattagami Lake mines, Mattagami, Galinee Township, Abitibi Co., Québec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 25678

IMA1972-003

PDF 11-553

Mattagamite Image

Images:

Mattagamite Altaite Tellurantimony

Comments: Silvery metallic intergrowths of mattagamite with tellurantimony and altaite.
Location: Mattagami Lake Mine, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mattagamite Crystallography

Axial Ratios:

a:b:c =0.8415:1:0.6164

Cell Dimensions:

a = 5.31, b = 6.31, c = 3.89, Z = 2; V = 130.34 Den(Calc)= 8.00

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): 2.805(1), 2.703(0.8), 2.066(0.6),

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 Mattagamite

Color:

Violet, Violet gray.

Diaphaniety:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Optical Properties of Mattagamite

RL Anisotrophism:

Weak, pinkish violet to grayish violet.

RL Color:

Violet.

RL Pleochroism:

Weak, colors from pink to cream.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Mattagamite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	50.20	62.20
420 nm	51.00	60.30
440 nm	51.80	58.40
460 nm	51.00	56.60
480 nm	49.90	55.60
500 nm	48.70	54.70
520 nm	48.20	54.20
540 nm	47.90	53.90
560 nm	47.80	53.90
580 nm	47.70	54.00
600 nm	47.80	54.30
620 nm	48.00	54.70
640 nm	48.30	55.20
660 nm	48.60	55.60
680 nm	48.90	56.30
700 nm	49.10	56.90

**Calculated Relative Intensity Colors of Mattagamite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Mattagamite

Electron Density:

r_electron=6.67 gm/cc
note: r_Mattagamite=8.00 gm/cc.

Fermion Index

Fermion Index = 0.06491
Boson Index = 0.93509

Photoelectric:

PE_Mattagamite= 306.08 barns/electron
U=PE_Mattagamite x r_electron=2,042.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mattagamite is Not Radioactive

Mattagamite Classification

Dana Class:

2.12.2.5 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.2)Marcasite Group (Orthorhombic: Pnnm)

2.12.2.1 Marcasite FeS2 Pnnm 2/m 2/m 2/m

2.12.2.2 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

2.12.2.3 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

2.12.2.4 Hastite CoSe2 Pnnm 2/m 2/m 2/m

2.12.2.5 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

2.12.2.6 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

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

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

2.12.2.9 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

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

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

2.12.2.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

2.12.2.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

II/D.20-60 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.20 - Markasite - Iridarsenite series

II/D.20-10 Marcasite FeS2 Pnnm 2/m 2/m 2/m

II/D.20-20 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

II/D.20-30 Hastite CoSe2 Pnnm 2/m 2/m 2/m

II/D.20-40 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

II/D.20-50 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

II/D.20-60 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

II/D.20-70 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

II/D.20-80 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

II/D.20-90 Iridarsenite (Ir,Ru)As2 P 2₁/c 2/m

Other Mattagamite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Mattagamite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Mattagamite

CoTe2
Dana No: 2.12.2.5 Strunz No: II/D.20-60
Locality:

Notes: