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Berndtite Mineral Data
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General Berndtite Information
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 Chemical Formula: |
SnS2 |
| Composition: |
Molecular Weight = 182.84 gm |
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Tin 64.92 % Sn |
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Sulfur 35.08 % S |
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______ |
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100.00 % |
| Empirical Formula: |
SnS2 |
| Environment: |
Secondary mineral in tin sulfide veins and in a high temperature deposit, hydrothermally altered. |
| IMA Status: |
Approved IMA 1964 |
| Locality: |
Cerro de Potosi, Bolivia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Fritz Berndt, German mineralogist. |
| Name Pronunciation: |
Berndtite + Pronunciation  |
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Berndtite Image |
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Images:
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Berndtite Crystallography
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| Axial Ratios: |
a:c = 1:1.61253 |
| Cell Dimensions: |
a = 3.639, c = 5.868, Z = 1; V = 67.30 Den(Calc)= 4.51 |
| Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.78(1), 2.14(0.5), 5.9(0.5), |
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Physical Properties of Berndtite
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| Cleavage: |
{0001} Good |
| Color: |
Grayish yellow, Yellow brown. |
| Density: |
4.5 |
| Diaphaneity: |
Transparent to Translucent |
| Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Hardness: |
1-2 - Between Talc and Gypsum |
| Luster: |
Adamantine |
| Streak: |
golden yellow |
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Optical Properties of Berndtite
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| Optical Data: |
Uniaxial (-), e=1.705, w=1.93, bire=0.2250. |
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Calculated Properties of Berndtite
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| Electron Density: |
Bulk Density (Electron Density)=4.05 gm/cc
note: Specific Gravity of Berndtite =4.51 gm/cc.
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| Fermion Index: |
Fermion Index = 0.11
Boson Index = 0.89 |
| Photoelectric: |
PEBerndtite = 201.35 barns/electron
U=PEBerndtite x rElectron Density= 814.53 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Berndtite is Not Radioactive |
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Berndtite Classification
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| Dana Class: |
02.12.14.05 (02)Sulfides - Including Selenides and Tellurides |
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(02.12)where Am Bn Xp, with (m+n):p=1:2 |
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(02.12.14)Melonite Group (Trigonal: P-3m1) AX2 type |
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02.12.14.01 Melonite NiTe2 P 3m1 3 2/m |
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02.12.14.02 Kitkaite NiTeSe P 3m1 3 2/m |
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02.12.14.03 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m |
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02.12.14.04 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m |
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02.12.14.05 Berndtite SnS2 P 3m1 3 2/m |
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02.12.14.06 Shuangfengite IrTe2 P 3m1 3 2/m |
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02.12.14.07 Sudovikovite! PtSe2 P 3m1 3 2/m |
| Strunz Class: |
02.EA.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.E - Metal Sulfides, M:S � 1:2 |
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02.EA -M:S = 1:2 |
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02.EA.20 Berndtite SnS2 P 3m1 3 2/m |
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02.EA.20 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m |
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02.EA.20 Melonite NiTe2 P 3m1 3 2/m |
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02.EA.20 Kitkaite NiTeSe P 3m1 3 2/m |
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02.EA.20 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m |
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02.EA.20 Sudovikovite! PtSe2 P 3m1 3 2/m |
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02.EA.20 Shuangfengite IrTe2 P 3m1 3 2/m |
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Other Berndtite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p1436,1990) OPTIC PROP.(Dana8) |
| See Also: |
Links to other databases for Berndtite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST
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Print or Cut-and-Paste your Berndtite Specimen Label here :
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Berndtite
SnS2
Dana No: 02.12.14.05 Strunz No: 02.EA.20
Locality:
Notes:
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