Tetrataenite Mineral Data

Tetrataenite Mineral Data +

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General Tetrataenite Information

Chemical Formula:

FeNi

Composition:

Molecular Weight = 57.27 gm

Iron 48.76 % Fe

Nickel 51.24 % Ni

______

100.00 %

Empirical Formula:

Fe⁰⁺_0.5Ni_0.5

Environment:

Exsolution rims and grains in meteorites and exsolved with antitaenite.

IMA Status:

Approved IMA 1979

Locality:

Mesosiderite meteorites and slowly-cooled chondrites below 350 deg. C. Link to MinDat.org Location Data.

Name Origin:

Named for taenite and the tetragonal crystal form of this polymorph.

Synonym:

ICSD 77284

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Tetrataenite Crystallography

Axial Ratios:

a:c = 1:1.41413

Cell Dimensions:

a = 2.533, c = 3.582, Z = 2; V = 22.98 Den(Calc)= 8.28

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm

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

By Intensity(I/I_o): 3.34(1), 2.526(0.8), 2.879(0.8),

Physical Properties of Tetrataenite

Cleavage:

None

Color:

Gray white, Silver white.

Density:

8.275

Diaphaniety:

Opaque

Fracture:

Malleable - Deforms rather than breaking apart with a hammer.

Habit:

Exsolution Inclusions - Formed by the exsolution of a separate mineral from the parent mineral caused by a temperature drop.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Magnetism:

Magnetic

Streak:

gray

Optical Properties of Tetrataenite

RL Anisotrophism:

Distinct on well-polished surfaces, bluish green to brownish orange.

RL Color:

Creamy white.

Calculated Properties of Tetrataenite

Electron Density:

r_electron=7.81 gm/cc
note: r_Tetrataenite=8.28 gm/cc.

Fermion Index

Fermion Index = 0.01612
Boson Index = 0.98388

Photoelectric:

PE_Tetrataenite= 35.95 barns/electron
U=PE_Tetrataenite x r_electron= 280.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tetrataenite is Not Radioactive

Tetrataenite Classification

Dana Class:

1.1.11.3 (1)Native Elements

(1.1)with metallic elements other than the platinum group

(1.1.11)Iron-Nickel group

1.1.11.0 Iron! Fe I m3m 4/m 3 2/m

1.1.11.1 Kamacite alpha-(Fe,Ni) F m3m 4/m 3 2/m

1.1.11.2 Taenite gamma-(Fe,Ni) F m3m 4/m 3 2/m

1.1.11.3 Tetrataenite FeNi P 4/mmm 4/m 2/m 2/m

1.1.11.4 Awaruite Ni2FetoNi3Fe P m3m 4/m 3 2/m

1.1.11.5 Nickel Ni F m3m 4/m 3 2/m

1.1.11.6 Wairauite CoFe P m3m 4/m 3 2/m

Strunz Class:

I/A.08-30 I - Elements

I/A - Metallic and intermetallic compounds, Carbides, Nitrides, Phosphides and Silicides

I/A.08 - Nickel series

I/A.08-10 Nickel Ni F m3m 4/m 3 2/m

I/A.08-20 Taenite gamma-(Fe,Ni) F m3m 4/m 3 2/m

I/A.08-30 Tetrataenite FeNi P 4/mmm 4/m 2/m 2/m

I/A.08-40 Awaruite Ni2FetoNi3Fe P m3m 4/m 3 2/m

I/A.08-50 Jedwabite! Fe7(Ta,Nb)3 P 6₃mmc, P 6₃mc 6mm

Other Tetrataenite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

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Tetrataenite

FeNi
Dana No: 1.1.11.3 Strunz No: I/A.08-30
Locality:

Notes: