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Berndtite

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Formula:
SnS
 
2
System:TrigonalColour:Yellow-brown
Hardness:1 - 2
Name:
For Dr. Fritz Berndt, born 14-11-1916, German Mineralogist at Corporation Minera de Bolivia, Oruro.


Melonite Group. There are two polytypes, -2T and -4H.

Classification of Berndtite

IMA status:Approved
Strunz 8th edition ID:2/D.28-10
Nickel-Strunz 10th (pending) edition ID:2.EA.20

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
A : M:S = 1:2 - With Cu, Ag, Au
Dana 8th edition ID:2.12.14.5

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
Hey's CIM Ref.:3.6.3

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
6 : Sulphides etc. of Sb and Pb
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Type Occurrence of Berndtite

Type Locality:Cerro de Potosí (Cerro Rico), Potosí City, Potosí Department, Bolivia

Physical Properties of Berndtite

Lustre:Resinous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Yellow-brown
Streak:Golden yellow
Hardness (Mohs):1 - 2
Cleavage:Distinct/Good
On {0001}
Density (measured):4.5 g/cm3
Density (calculated):4.55 g/cm3
Comment:Measured on synthetic material

Crystallography of Berndtite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:P3m1 {P3 2/m 1}
Space Group Setting:P3m1
Cell Parameters:a = 3.639Å, c = 5.868Å
Ratio:a:c = 1 : 1.613
Unit Cell Volume:V 67.30 ų (Calculated from Unit Cell)
Z:1
Morphology:Tabular hexagonal crystals
Comment:On C6 polymorph

Optical Data of Berndtite

Type:Uniaxial (-)
RI values: nω = 1.930 nε = 1.705
Maximum Birefringence:δ = 0.225

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Type:Anisotropic
Anisotropism:Dark greenish gray
Colour in reflected light:Gray
Internal Reflections:Intense brownish to orange-yellow
Pleochroism:Strong

Chemical Properties of Berndtite

Formula:
SnS
 
2
Simplified for copy/paste:SnS2
Essential elements:S, Sn
All elements listed in formula:S, Sn

Relationship of Berndtite to other Species

Common Associates:
SulphurStannitePyriteCassiterite
Related Minerals - Nickel-Strunz Grouping):

- +
2.EA.05Sylvanite
(Au,Ag)
 
2
Te
 
4
2.EA.10Calaverite
AuTe
 
2
2.EA.15Kostovite
CuAuTe
 
4
2.EA.15Krennerite
(Au,Ag)Te
 
2
2.EA.20Kitkaite
NiTeSe
2.EA.20Melonite
NiTe
 
2
2.EA.20Merenskyite
(Pd,Pt)(Te,Bi)
 
2
2.EA.20Moncheite
(Pt,Pd)(Te,Bi)
 
2
2.EA.20Shuangfengite
IrTe
 
2
2.EA.20Sudovikovite
PtSe
 
2
2.EA.25Verbeekite
PdSe
 
2
2.EA.30Drysdallite
Mo(Se,S)
 
2
2.EA.30Jordisite
MoS
 
2
2.EA.30Molybdenite
MoS
 
2
2.EA.30Tungstenite
WS
 
2
Related Minerals - Hey's Index Grouping:

- +
3.6.1Herzenbergite
(Sn,Pb)SnS
 
2
3.6.2Ottemannite
beta Sn
 
2
S
 
3
3.6.4Stistaite
SnSb
3.6.5Galena
PbS
3.6.6Clausthalite
PbSe
3.6.7Altaite
PbTe
3.6.8Furutobeite
(Cu,Ag)
 
6
PbS
 
4
3.6.9Aschamalmite
Pb
 
6
Bi
 
2
S
 
9
3.6.10Betekhtinite
Pb
 
2
(Cu,Fe)
 
21
S
 
15
3.6.11Shadlunite
(Pb,Cd)(Fe,Cu)
 
8
S
 
8

Other Names for Berndtite

Other Languages:
German:Berndtit
Russian:Берндтит
Spanish:Berndtita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Berndtite

Reference List:

- +
Moh, G.H. and Berndt, F. (1965) American Mineralogist, 50, 2107.

American Mineralogist: 51: 1551.

American Mineralogist: 58: 347.

American Mineralogist: 60: 739.

Internet Links for Berndtite

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  • Raman and XRD data at RRUFF project
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  • Localities for Berndtite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Bolivia
     
    • Oruro Department
      • Avaroa Province
        • Huari
    Van King
    • Potosí Department
      • Potosí City
    Moh, G.H. and Berndt, F. (1965) American Mineralogist, 50, 2107.
    Germany
     
    • Thuringia
      • Gera
        • Ronneburg U deposit
    T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
    Japan
     
    • Hokkaido
      • Sapporo
    The Mineral Species of Japan (5th ed) Matsubara; Min. Jour. (Japan): 15:222-232.
    Namibia
     
    • Erongo Region
      • Karibib District
        • Spitzkopje Area
          • Klein Spitzkopje granite stock (Kleine Spitzkoppe)
    http://rruff.geo.arizona.edu/doclib/hom/berndtite.pdf#search=%22berndtite%22
      • Swakopmund District
        • Arandis
    No reference
    Portugal
     
    • Castelo Branco District
      • Covilhã
        • Panasqueira
    Sopa de Pedras, A. M. Galopim de Carvalho, Gradiva, Lisbon
    USA
     
    • Pennsylvania
      • Schuylkill Co.
    Reed, Juliet C. (1976), Annotated Biblio. of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of PA, Inc.: 19; Grant, R.W. (Apr 74), PA Mins. (PM)(136), Keystone Newsletter; Finkelman, et al, Geol. Soc. Am. Abstracts with Program
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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