Mineralogy Database

Tochilinite Mineral Data

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General Tochilinite Information

Help on Chemical  Formula: Chemical Formula: 6Fe0.9S•5(Mg,Fe++)(OH)2
Help on Composition: Composition: Molecular Weight = 904.38 gm
   Magnesium  12.77 %  Mg
   Iron       51.56 %  Fe
   Hydrogen    0.22 %  H
   Sulfur     31.91 %  S
   Oxygen      3.54 %  O
             100.00 % 
Help on Empirical Formula: Empirical Formula: 9(Fe2+0.9)S95(Mg0.95)5(Fe2+0.05)(OH)2
Help on Environment: Environment: Ultramafic bodies, diamond pipes, and carbonaceous chondrite meteorites.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Mamonovo deposit, Voronezh. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mitrofan S.Tochilin (1910-1968), Russian scientist.
Help on Name Pronunciation: Name Pronunciation: Tochilinite + Pronunciation Say TOCHILINITE

Tochilinite Image

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Comments: Grayish-black, metallic wires of tochilinite on matrix.
Location: Brosso Mine, Ivrea, Piedmont, Italy. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Tochilinite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3442:1:0.7007
Help on Cell Dimensions: Cell Dimensions: a = 5.35, b = 15.54, c = 10.89, Z = 2; beta = 94.81° V = 902.20 Den(Calc)= 3.33
Help on Crystal System: Crystal System: Monoclinic Space Group: P 2, Pm, or P 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.41(1), 2.32(0.5), 1.86(0.4),10.94(0.4), 1.75(0.3), 1.53(0.2), 2.05(0.2), 2.63(0.2),

Physical Properties of Tochilinite

Help on Cleavage: Cleavage: {001} Distinct
Help on Color: Color: Bronze black.
Help on Density: Density: 2.96 - 2.99, Average = 2.97
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Cylindrical - Shaped like a cylinder.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 1-1.5 - Talc or a little harder
Help on Luster: Luster: Metallic

Optical Properties of Tochilinite

Help on RL Anisotrophism: RL Anisotrophism: Strong, pinkish-cream to gray.
Help on RL Color: RL Color: Yellowish brown.
Help on RL Pleochroism: RL Pleochroism: Strong, from yellowish orange to yellowish gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tochilinite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 486 nm   10.00   13.30 
 546 nm   10.20   14.90 
 589 nm   10.60   15.80 
 644 nm   10.80   17.60 
Calculated Relative Intensity Colors of Tochilinite in Air
   0%   90% 100% 180% 270% 360% 450% 540% 630% 720% 810% 880%

Calculated Properties of Tochilinite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Tochilinite =3.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PETochilinite = 17.50 barns/electron
U=PETochilinite x rElectron Density= 56.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tochilinite is Not Radioactive

Tochilinite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.14)(Hydroxyl or Hydrated)
  (02.14.02)Dana Group Tochilinite 6Fe0.9S•5(Mg,Fe)(OH)2 P 2, Pm, or P 2/m Mono
Help on  Strunz Class: Strunz Class: 02.FD.35 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  02.FD -With O, OH, H2O
02.FD.35 Tochilinite 6Fe0.9S•5(Mg,Fe)(OH)2 P 2, Pm, or P 2/m Mono

Other Tochilinite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Tochilinite :
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.FD.35





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