Tochilinite Mineral Data + Say TOCHILINITE

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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.
 

Tochilinite Image

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Tochilinite

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: MonoclinicSpace 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),
Click Here for Large Tochilinite Structure Window Crystal Structure:

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Organova N I , Drits V A , Dmitrik A L , Soviet Physics - Crystallography , 17 (1973) p.667-671, Structural study of tochilinite. Part I. The isometric variety, Note: M-site reported bond lengths are inconsistent with reported structure

 

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 Diaphaniety: Diaphaniety: 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
Relative
Intensity		    0%   90% 100% 180% 270% 360% 450% 540% 630% 720% 810% 880%
R1                        
R2                        
 

Calculated Properties of Tochilinite

Help on Electron Density: Electron Density:

relectron=3.21 gm/cc
note: rTochilinite =3.33 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0261
Boson Index = 0.9739
Help on Photoelectric: Photoelectric:

PETochilinite = 17.50 barns/electron
U=PETochilinite x relectron= 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: 2.14.2.1 (2)Sulfides - Including Selenides and Tellurides
  (2.14)(Hydroxyl or Hydrated)
  (2.14.2)Dana Group
 
2.14.2.1 Tochilinite 6Fe0.9S·5(Mg,Fe)(OH)2 P 2, Pm, or P 2/m Mono
Help on Strunz Class: Strunz Class: II/C.23-40 II - Sulfides and sulphosalts
  II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1
  II/C.23 - Yushkinite - Vyalsovite series
 
II/C.23-10 Yushkinite V1-xS·n(Mg,Al)(OH)2 P 3m1 3m
 
II/C.23-20 Valleriite 4(Fe,Cu)S·3(Mg,Al)(OH)2 R 3m 3 2/m
 
II/C.23-30 Haapalaite 2(Fe,Ni)S·1.6(Mg,Fe)(OH)2 R 3m ? 3 2/m
 
II/C.23-40 Tochilinite 6Fe0.9S·5(Mg,Fe)(OH)2 P 2, Pm, or P 2/m Mono
 
II/C.23-50 Vyalsovite FeS·Ca(OH)2·Al(OH)3 C mmm ? 2/m 2/m 2/m
 

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Tochilinite

6Fe0.9S·5(Mg,Fe++)(OH)2
Dana No: 2.14.2.1 Strunz No: II/C.23-40
Locality:

 

Notes:

 
 
   
 
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