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Tochilinite Mineral Data
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General Tochilinite Information
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 Chemical Formula: |
6Fe0.9S•5(Mg,Fe++)(OH)2 |
| Composition: |
Molecular Weight = 904.38 gm |
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Magnesium 12.77 % Mg |
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Iron 51.56 % Fe |
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Hydrogen 0.22 % H |
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Sulfur 31.91 % S |
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Oxygen 3.54 % O |
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______ |
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100.00 % |
| Empirical Formula: |
9(Fe2+0.9)S95(Mg0.95)5(Fe2+0.05)(OH)2 |
| Environment: |
Ultramafic bodies, diamond pipes, and carbonaceous chondrite meteorites. |
| IMA Status: |
Approved IMA 1971 |
| Locality: |
Mamonovo deposit, Voronezh. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Mitrofan S.Tochilin (1910-1968), Russian scientist. |
| Name Pronunciation: |
Tochilinite + Pronunciation  |
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Tochilinite Image |
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Images:
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Tochilinite Crystallography
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| Axial Ratios: |
a:b:c =0.3442:1:0.7007 |
| Cell Dimensions: |
a = 5.35, b = 15.54, c = 10.89, Z = 2; beta = 94.81° V = 902.20 Den(Calc)= 3.33 |
| Crystal System: |
Monoclinic Space Group: P 2, Pm, or P 2/m |
| 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), |
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Physical Properties of Tochilinite
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| Cleavage: |
{001} Distinct |
| Color: |
Bronze black. |
| Density: |
2.96 - 2.99, Average = 2.97 |
| Diaphaneity: |
Opaque |
| Habit: |
Acicular - Occurs as needle-like crystals. |
| Habit: |
Cylindrical - Shaped like a cylinder. |
| Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
| Hardness: |
1-1.5 - Talc or a little harder |
| Luster: |
Metallic |
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Optical Properties of Tochilinite
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| RL Anisotrophism: |
Strong, pinkish-cream to gray. |
| RL Color: |
Yellowish brown. |
| RL Pleochroism: |
Strong, from yellowish orange to yellowish gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Tochilinite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 486 nm |
10.00 |
13.30 |
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| 546 nm |
10.20 |
14.90 |
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| 589 nm |
10.60 |
15.80 |
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| 644 nm |
10.80 |
17.60 |
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Calculated Relative Intensity Colors of Tochilinite in Air
Relative
Intensity |
0% |
90% |
100% |
180% |
270% |
360% |
450% |
540% |
630% |
720% |
810% |
880% |
| R1 |
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| R2 |
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Calculated Properties of Tochilinite
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| Electron Density: |
Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Tochilinite =3.33 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PETochilinite = 17.50 barns/electron
U=PETochilinite x rElectron Density= 56.21 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tochilinite is Not Radioactive |
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Tochilinite Classification
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| Dana Class: |
02.14.02.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.14)(Hydroxyl or Hydrated) |
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(02.14.02)Dana Group |
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02.14.02.01 Tochilinite 6Fe0.9S•5(Mg,Fe)(OH)2 P 2, Pm, or P 2/m Mono |
| Strunz Class: |
02.FD.35 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O |
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02.FD -With O, OH, H2O |
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02.FD.35 Tochilinite 6Fe0.9S•5(Mg,Fe)(OH)2 P 2, Pm, or P 2/m Mono |
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Other Tochilinite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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
15 - WWW-MINCRYST
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Tochilinite
6Fe0.9S•5(Mg,Fe++)(OH)2
Dana No: 02.14.02.01 Strunz No: 02.FD.35
Locality:
Notes:
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