Troilite Mineral Data

General Troilite Information

Chemical Formula:

FeS

Composition:

Molecular Weight = 87.91 gm

Iron 63.53 % Fe

Sulfur 36.47 % S

______

100.00 %

Empirical Formula:

Fe²⁺S

Environment:

Found in serpentinites, in layered ultramafic intrusives, and as nodules in meteorites.

IMA Status:

Valid Species (Pre-IMA) 1863

Locality:

Albareto meteorite, Albareto, Modena, Emilia-Romagna, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Dominico Troili, who described, in 1766, a meteorite which fell in Albareto, near Modena, Italy.

Name Pronunciation:

Troilite

Troilite Image

Images:

Troilite Cohenite Kamacite Taenite

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:

Troilite Kamacite Taenite

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

Troilite Crystallography

Axial Ratios:

a:c = 1:1.66917

Cell Dimensions:

a = 3.452, c = 5.762, Z = 2; V = 59.46 Den(Calc)= 4.91

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.09(1), 2.66(0.6), 1.72(0.5),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Skala R , Cisarova I , Drabek M , American Mineralogist , 91 (2006) p.917-921, Inversion twinning in troilite, Sample: Etter

View Additional jPOWD Structure files for Troilite
[1] [2] [3] [4] [5]

Physical Properties of Troilite

Cleavage:

None

Color:

Bronze brown, Gray brown.

Density:

4.58 - 4.65, Average = 4.61

Diaphaneity:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

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

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Strongly magnetic

Streak:

gray black

Optical Properties of Troilite

RL Anisotrophism:

Strong.

Calculated Properties of Troilite

Electron Density:

Bulk Density (Electron Density)=4.69 gm/cc
note: Specific Gravity of Troilite =4.91 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Troilite= 21.27 barns/electron
U=PE_Troilite x rElectron Density= 99.79 barns/cc.

Radioactivity:

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

Troilite Classification

Dana Class:

02.08.09.01 (02)Sulfides - Including Selenides and Tellurides

(02.08)where Am Bn Xp, with (m+n):p=1:1

(02.08.09)Dana Group

02.08.09.01 Troilite FeS P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

02.CC.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CC -With Ni, Fe, Co, PGE, etc.

02.CC.10 Smythite (Fe,Ni)9S11or(Fe,Ni)13S16 R 3m 3 2/m

02.CC.10 Pyrrhotite Fe(1-x)S(x=0-0.17) A2/a 2/m

02.CC.10 Troilite FeS P 6₃/mmc 6/m 2/m 2/m

Other Troilite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Troilite :
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 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Troilite here :
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Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Troilite Specimen Label here :

Troilite

FeS
Dana No: 02.08.09.01 Strunz No: 02.CC.10
Locality:

Notes: