Mineralogy Database

Berndtite Mineral Data

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General Berndtite Information

Help on Chemical  Formula: Chemical Formula: SnS2
Help on Composition: Composition: Molecular Weight = 182.84 gm
   Tin     64.92 %  Sn
   Sulfur  35.08 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: SnS2
Help on Environment: Environment: Secondary mineral in tin sulfide veins and in a high temperature deposit, hydrothermally altered.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Cerro de Potosi, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Fritz Berndt, German mineralogist.
Help on Name Pronunciation: Name Pronunciation: Berndtite + Pronunciation Say BERNDTITE

Berndtite Image

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  Berndtite   Tschermigite

Comments: Yellow crystalline berndtite on tschermigite.
Location: Shamokin, Northumberland County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Berndtite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.61253
Help on Cell Dimensions: Cell Dimensions: a = 3.639, c = 5.868, Z = 1; V = 67.30 Den(Calc)= 4.51
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.78(1), 2.14(0.5), 5.9(0.5),

Physical Properties of Berndtite

Help on Cleavage: Cleavage: {0001} Good
Help on Color: Color: Grayish yellow, Yellow brown.
Help on Density: Density: 4.5
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Adamantine
Help on Streak: Streak: golden yellow

Optical Properties of Berndtite

Help on Optical Data: Optical Data: Uniaxial (-), e=1.705, w=1.93, bire=0.2250.

Calculated Properties of Berndtite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.05 gm/cc
note: Specific Gravity of Berndtite =4.51 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PEBerndtite = 201.35 barns/electron
U=PEBerndtite x rElectron Density= 814.53 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Berndtite is Not Radioactive

Berndtite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.12)where Am Bn Xp, with (m+n):p=1:2
  (02.12.14)Melonite Group (Trigonal: P-3m1) AX2 type Melonite NiTe2 P 3m1 3 2/m Kitkaite NiTeSe P 3m1 3 2/m Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m Berndtite SnS2 P 3m1 3 2/m Shuangfengite IrTe2 P 3m1 3 2/m Sudovikovite! PtSe2 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 02.EA.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.E - Metal Sulfides, M:S � 1:2
  02.EA -M:S = 1:2
02.EA.20 Berndtite SnS2 P 3m1 3 2/m
02.EA.20 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m
02.EA.20 Melonite NiTe2 P 3m1 3 2/m
02.EA.20 Kitkaite NiTeSe P 3m1 3 2/m
02.EA.20 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m
02.EA.20 Sudovikovite! PtSe2 P 3m1 3 2/m
02.EA.20 Shuangfengite IrTe2 P 3m1 3 2/m

Other Berndtite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p1436,1990) OPTIC PROP.(Dana8)
Help on See Also: 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

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Dana No: Strunz No: 02.EA.20





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