Tetrataenite Mineral Data (original) (raw)
General Tetrataenite Information
FeNi
Molecular Weight = 57.27 gm
Iron 48.76 % Fe
Nickel 51.24 % Ni
______
100.00 %
Fe0+0.5Ni0.5
Exsolution rims and grains in meteorites and exsolved with antitaenite.
Approved IMA 1979
Mesosiderite meteorites and slowly-cooled chondrites below 350 deg. C. Link to MinDat.org Location Data.
Named for taenite and the tetragonal crystal form of this polymorph.
ICSD 77284
Tetrataenite Image
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
a:c = 1:1.41413
a = 2.533, c = 3.582, Z = 2; V = 22.98 Den(Calc)= 8.28
Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm
By Intensity(I/Io): 3.34(1), 2.526(0.8), 2.879(0.8),
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| | Clarke R S , Scott E R D , American Mineralogist , 65 (1980) p.624-630, Tetrataenite - ordered FeNi, a new mineral in meteorites, Locality: Cape Town iron meteorite | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Tetrataenite
None
Gray white, Silver white.
8.275
Opaque
Malleable - Deforms rather than breaking apart with a hammer.
Exsolution Inclusions - Formed by the exsolution of a separate mineral from the parent mineral caused by a temperature drop.
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Massive - Granular - Common texture observed in granite and other igneous rock.
3.5 - Copper Penny
Metallic
Magnetic
gray
Optical Properties of Tetrataenite
Distinct on well-polished surfaces, bluish green to brownish orange.
Creamy white.
Calculated Properties of Tetrataenite
Bulk Density (Electron Density)=7.81 gm/cc
note: Specific Gravity of Tetrataenite =8.28 gm/cc.
Fermion Index = 0.01
Boson Index = 0.99
PETetrataenite = 35.95 barns/electron
U=PETetrataenite x rElectron Density= 280.71 barns/cc.
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tetrataenite is Not Radioactive
Tetrataenite Classification
01.01.11.03 (01)Native Elements
(01.01)with metallic elements other than the platinum group
(01.01.11)Iron-Nickel group
01.01.11.00 Iron! Fe I m3m 4/m 3 2/m
01.01.11.01 Kamacite? alpha-(Fe,Ni) F m3m 4/m 3 2/m
01.01.11.02 Taenite gamma-(Fe,Ni) F m3m 4/m 3 2/m
01.01.11.03 Tetrataenite FeNi P 4/mmm 4/m 2/m 2/m
01.01.11.04 Awaruite Ni2FetoNi3Fe P m3m 4/m 3 2/m
01.01.11.05 Nickel Ni F m3m 4/m 3 2/m
01.01.11.06 Wairauite CoFe P m3m 4/m 3 2/m
01.AE.10 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
01.A - Metals and Intermetallic Alloys
01.AE -Iron-chromium family
01.AE.10 Antitaenite* gamma-Fe3Ni Unk Cubic
01.AE.10 Taenite gamma-(Fe,Ni) F m3m 4/m 3 2/m
01.AE.10 Tetrataenite FeNi P 4/mmm 4/m 2/m 2/m
Other Tetrataenite Information
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
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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Tetrataenite
FeNi
Dana No: 01.01.11.03 Strunz No: 01.AE.10
Locality:
Notes: