Mineralogy Database

Troilite Mineral Data

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General Troilite Information

Help on Chemical  Formula: Chemical Formula: FeS
Help on Composition: Composition: Molecular Weight = 87.91 gm
   Iron    63.53 %  Fe
   Sulfur  36.47 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+S
Help on Environment: Environment: Found in serpentinites, in layered ultramafic intrusives, and as nodules in meteorites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1863
Help on Locality: Locality: Albareto meteorite, Albareto, Modena, Emilia-Romagna, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Dominico Troili, who described, in 1766, a meteorite which fell in Albareto, near Modena, Italy.
Help on Name Pronunciation: Name Pronunciation: Troilite Say TROILITE

Troilite Image

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  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

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  Kamacite   Taenite   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

Troilite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.66917
Help on Cell Dimensions: Cell Dimensions: a = 3.452, c = 5.762, Z = 2; V = 59.46 Den(Calc)= 4.91
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.09(1), 2.66(0.6), 1.72(0.5),

Physical Properties of Troilite

Help on Cleavage: Cleavage: None
Help on Color: Color: Bronze brown, Gray brown.
Help on Density: Density: 4.58 - 4.65, Average = 4.61
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Strongly magnetic
Help on Streak: Streak: gray black

Optical Properties of Troilite

Help on RL Anisotrophism: RL Anisotrophism: Strong.

Calculated Properties of Troilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.69 gm/cc
note: Specific Gravity of Troilite =4.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETroilite = 21.27 barns/electron
U=PETroilite x rElectron Density= 99.79 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Troilite is Not Radioactive

Troilite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.08)where Am Bn Xp, with (m+n):p=1:1
  (02.08.09)Dana Group Troilite FeS P 63/mmc 6/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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

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Dana No: Strunz No: 02.CC.10





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