Taenite Mineral Data

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General Taenite Information

Chemical Formula:

gamma-(Fe,Ni)

Composition:

Molecular Weight = 56.42 gm

Iron 79.19 % Fe

Nickel 20.81 % Ni

______

100.00 %

Empirical Formula:

Fe⁰⁺_0.8Ni_0.2

Environment:

Primarily found in meteorites. Resistant to acid etch where it stands out in patterns.

IMA Status:

Valid Species (Pre-IMA) 1861

Locality:

Gorge River, South Island, New Zealand Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "band" in allusion to the flattened form.

Name Pronunciation:

Taenite

Synonym:

Antitaenite

Plessite - Taenite and Kamacite

Taenite Image

Images:

Taenite Troilite Cohenite Kamacite

Comments: Brown masses of troilite, with white cohenite, in kamacite/taenite matrix, in meteorite (polished section).
Location: Meteor Crater, Canyon Diablo, Coconino County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Taenite Kamacite Troilite

Comments: Polished and acid etched slice, with crust, illustrating Widmanstaaten lines, with taenite darker areas between kamacite crystals, with tarnished troilite inclusions, in fine octahedrite meteorite.
Location: Gibeon Meteorite, found 1836, Great Namaqualand, Hardap, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Taenite

Comments: Massive taenite, altering, intermixed with kamacite, in meteorite.
Location: Agtalilik Meteorite, Melville Bay, Greenland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Taenite Crystallography

Cell Dimensions:

a = 3.596, Z = 4; V = 46.50 Den(Calc)= 8.06

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.08(1), 1.08(0.8), 1.8(0.8),1.04(0.5), 1.27(0.5), 0.9(0.3),

Physical Properties of Taenite

Cleavage:

None

Color:

Grayish white, Silver white.

Density:

7.8 - 8.22, Average = 8.01

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:

5-5.5 - Apatite-Knife Blade

Luster:

Metallic

Magnetism:

Magnetic

Streak:

light gray

Calculated Properties of Taenite

Electron Density:

Bulk Density (Electron Density)=7.54 gm/cc
note: Specific Gravity of Taenite =8.06 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Taenite= 33.05 barns/electron
U=PE_Taenite x rElectron Density= 249.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Taenite is Not Radioactive

Taenite Classification

Dana Class:

01.01.11.02 (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

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 Taenite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Taenite :
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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Ask about Taenite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Taenite Specimen Label here :

Taenite

gamma-(Fe,Ni)
Dana No: 01.01.11.02 Strunz No: 01.AE.10
Locality:

Notes: