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Berndtite

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Fritz Berndt
Formula:
SnS2
System:
Trigonal
Colour:
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

Approved
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
2.12.14.5

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
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

Physical Properties of Berndtite

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

Crystallography of Berndtite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
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
Max Birefringence:
δ = 0.225
Image 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:
SnS2
Essential elements:
All elements listed in formula:

Relationship of Berndtite to other Species

2.EA.05Sylvanite(Au,Ag)2Te4
2.EA.10CalaveriteAuTe2
2.EA.15KostoviteCuAuTe4
2.EA.15KrenneriteAu3AgTe8
2.EA.20KitkaiteNiTeSe
2.EA.20MeloniteNiTe2
2.EA.20Merenskyite(Pd,Pt)(Te,Bi)2
2.EA.20Moncheite(Pt,Pd)(Te,Bi)2
2.EA.20ShuangfengiteIrTe2
2.EA.20SudovikovitePtSe2
2.EA.25VerbeekitePdSe2
2.EA.30DrysdalliteMo(Se,S)2
2.EA.30JordisiteMoS2
2.EA.30MolybdeniteMoS2
2.EA.30TungsteniteWS2
3.6.1Herzenbergite(Sn,Pb)SnS2
3.6.2Ottemannitebeta Sn2S3
3.6.4StistaiteSnSb
3.6.5GalenaPbS
3.6.6ClausthalitePbSe
3.6.7AltaitePbTe
3.6.8Furutobeite(Cu,Ag)6PbS4
3.6.9AschamalmitePb6Bi2S9
3.6.10Betekhtinite(Cu,Fe)21Pb2S15
3.6.11Shadlunite(Pb,Cd)(Fe,Cu)8S8

Other Names for Berndtite

Name in Other Languages:
German:Berndtit
Spanish:Berndtita

Other Information

Health Risks:
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

Localities for Berndtite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
      • Minami-ku
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
Mineral and/or Locality  
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