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Tetrataenite Mineral Data
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General Tetrataenite Information
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Chemical Formula: |
FeNi |
Composition: |
Molecular Weight = 57.27 gm |
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Iron 48.76 % Fe |
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Nickel 51.24 % Ni |
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______ |
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100.00 % |
Empirical Formula: |
Fe0+0.5Ni0.5 |
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. |
Name Pronunciation: |
Tetrataenite + Pronunciation |
Synonym: |
ICSD 77284 |
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Tetrataenite Image |
Images:
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Tetrataenite
Comments: a) B&W reflected-light image of lightly etched tetraraenite (Tt), cloudy taenite (CT), and kamacite (K) and b) X-polarizer image showing unetched optical anisotropy and irregular crystals in the tetrataenite rim.
Location: Estherville mesosiderite meteorite. AmMin v65:624.
Scale: Scale Bar 50 µm.
© American Mineralogist |
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Tetrataenite Crystallography
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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 Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm |
X Ray Diffraction: |
By Intensity(I/Io): 3.34(1), 2.526(0.8), 2.879(0.8), |
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Physical Properties of Tetrataenite
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Cleavage: |
None |
Color: |
Gray white, Silver white. |
Density: |
8.275 |
Diaphaneity: |
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 |
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Optical Properties of Tetrataenite
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RL Anisotrophism: |
Distinct on well-polished surfaces, bluish green to brownish orange. |
RL Color: |
Creamy white. |
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Calculated Properties of Tetrataenite
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Electron Density: |
Bulk Density (Electron Density)=7.81 gm/cc note: Specific Gravity of Tetrataenite =8.28 gm/cc. |
Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
Photoelectric: |
PETetrataenite = 35.95 barns/electron U=PETetrataenite x rElectron Density= 280.71 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tetrataenite is Not Radioactive |
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Tetrataenite Classification
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Dana Class: |
01.01.11.03 (01)Native Elements |
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(01.01)with metallic elements other than the platinum group |
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(01.01.11)Iron-Nickel group |
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01.01.11.00 Iron! Fe I m3m 4/m 3 2/m |
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01.01.11.01 Kamacite? alpha-(Fe,Ni) F m3m 4/m 3 2/m |
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01.01.11.02 Taenite gamma-(Fe,Ni) F m3m 4/m 3 2/m |
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01.01.11.03 Tetrataenite FeNi P 4/mmm 4/m 2/m 2/m |
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01.01.11.04 Awaruite Ni2FetoNi3Fe P m3m 4/m 3 2/m |
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01.01.11.05 Nickel Ni F m3m 4/m 3 2/m |
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01.01.11.06 Wairauite CoFe P m3m 4/m 3 2/m |
Strunz Class: |
01.AE.10 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides) |
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01.A - Metals and Intermetallic Alloys |
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01.AE -Iron-chromium family |
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01.AE.10 Antitaenite* gamma-Fe3Ni Unk Cubic |
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01.AE.10 Taenite gamma-(Fe,Ni) F m3m 4/m 3 2/m |
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01.AE.10 Tetrataenite FeNi P 4/mmm 4/m 2/m 2/m |
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Other Tetrataenite Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Tetrataenite :
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 - Meteorite Minerals
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
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Print or Cut-and-Paste your Tetrataenite Specimen Label here :
Tetrataenite
FeNi
Dana No: 01.01.11.03 Strunz No: 01.AE.10
Locality:
Notes:
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