Mineralogy Database

Tetrataenite Mineral Data

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General Tetrataenite Information

Help on Chemical  Formula: Chemical Formula: FeNi
Help on Composition: Composition: Molecular Weight = 57.27 gm
   Iron    48.76 %  Fe
   Nickel  51.24 %  Ni
          100.00 % 
Help on Empirical Formula: Empirical Formula: Fe0+0.5Ni0.5
Help on Environment: Environment: Exsolution rims and grains in meteorites and exsolved with antitaenite.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Mesosiderite meteorites and slowly-cooled chondrites below 350 deg. C. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for taenite and the tetragonal crystal form of this polymorph.
Help on Name Pronunciation: Name Pronunciation: Tetrataenite + Pronunciation Say TETRATAENITE
Help on Synonym: Synonym: ICSD 77284

Tetrataenite Image

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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

Tetrataenite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.41413
Help on Cell Dimensions: Cell Dimensions: a = 2.533, c = 3.582, Z = 2; V = 22.98 Den(Calc)= 8.28
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.34(1), 2.526(0.8), 2.879(0.8),

Physical Properties of Tetrataenite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray white, Silver white.
Help on Density: Density: 8.275
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Malleable - Deforms rather than breaking apart with a hammer.
Help on Habit: Habit: Exsolution Inclusions - Formed by the exsolution of a separate mineral from the parent mineral caused by a temperature drop.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Magnetic
Help on Streak: Streak: gray

Optical Properties of Tetrataenite

Help on RL Anisotrophism: RL Anisotrophism: Distinct on well-polished surfaces, bluish green to brownish orange.
Help on RL Color: RL Color: Creamy white.

Calculated Properties of Tetrataenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.81 gm/cc
note: Specific Gravity of Tetrataenite =8.28 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETetrataenite = 35.95 barns/electron
U=PETetrataenite x rElectron Density= 280.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tetrataenite is Not Radioactive

Tetrataenite Classification

Help on  Dana Class: Dana Class: (01)Native Elements
  (01.01)with metallic elements other than the platinum group
  (01.01.11)Iron-Nickel group Iron! Fe I m3m 4/m 3 2/m Kamacite? alpha-(Fe,Ni) F m3m 4/m 3 2/m Taenite gamma-(Fe,Ni) F m3m 4/m 3 2/m Tetrataenite FeNi P 4/mmm 4/m 2/m 2/m Awaruite Ni2FetoNi3Fe P m3m 4/m 3 2/m Nickel Ni F m3m 4/m 3 2/m Wairauite CoFe P m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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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Dana No: Strunz No: 01.AE.10





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