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Berndtite

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Fritz Berndt
Formula:
SnS2
Colour:
Yellow-brown
Lustre:
Resinous
Hardness:
1 - 2
Specific Gravity:
4.5
Crystal System:
Trigonal
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.


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Classification of BerndtiteHide

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

Physical Properties of BerndtiteHide

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

Optical Data of BerndtiteHide

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 BerndtiteHide

Formula:
SnS2

Crystallography of BerndtiteHide

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

Type Occurrence of BerndtiteHide

Other Language Names for BerndtiteHide

German:Berndtit
Spanish:Berndtita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tschermigite1 photo of Berndtite associated with Tschermigite on mindat.org.
Herzenbergite1 photo of Berndtite associated with Herzenbergite on mindat.org.
Ottemannite1 photo of Berndtite associated with Ottemannite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.EA.05Sylvanite(Au,Ag)2Te4Mon. 2/m : P2/b
2.EA.10CalaveriteAuTe2Mon.
2.EA.15KostoviteCuAuTe4Orth.
2.EA.15KrenneriteAu3AgTe8Orth. mm2 : Pma2
2.EA.20KitkaiteNiTeSeTrig.
2.EA.20MeloniteNiTe2Trig.
2.EA.20Merenskyite(Pd,Pt)(Te,Bi)2Trig. 3m : P3m1
2.EA.20Moncheite(Pt,Pd)(Te,Bi)2Trig.
2.EA.20ShuangfengiteIrTe2Trig.
2.EA.20SudovikovitePtSe2Trig.
2.EA.25VerbeekitePdSe2Mon.
2.EA.30DrysdalliteMo(Se,S)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.EA.30JordisiteMoS2
2.EA.30MolybdeniteMoS2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.EA.30TungsteniteWS2Trig. 3m : R3m

Related Minerals - Dana Grouping (8th Ed.)Hide

2.12.14.1MeloniteNiTe2Trig.
2.12.14.2KitkaiteNiTeSeTrig.
2.12.14.3Moncheite(Pt,Pd)(Te,Bi)2Trig.
2.12.14.4Merenskyite(Pd,Pt)(Te,Bi)2Trig. 3m : P3m1
2.12.14.6ShuangfengiteIrTe2Trig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.6.1Herzenbergite(Sn,Pb)SnS2Orth.
3.6.2Ottemannitebeta Sn2S3
3.6.4StistaiteSnSbTrig. 3m (3 2/m) : R3m
3.6.5GalenaPbSIso. m3m (4/m 3 2/m) : Fm3m
3.6.6ClausthalitePbSeIso. m3m (4/m 3 2/m) : Fm3m
3.6.7AltaitePbTeIso. m3m (4/m 3 2/m) : Fm3m
3.6.8Furutobeite(Cu,Ag)6PbS4Mon.
3.6.9AschamalmitePb6Bi2S9Mon. 2/m
3.6.10Betekhtinite(Cu,Fe)21Pb2S15Orth. mmm (2/m 2/m 2/m) : Immm
3.6.11Shadlunite(Pb,Cd)(Fe,Cu)8S8

Other InformationHide

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 BerndtiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 BerndtiteHide

Localities for BerndtiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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.; Eijun Ohta (1991) Polymetallic Mineralization at the Toyoha Mine, Hokkaido, Japan. Mining Geology 41:279-295
Namibia
 
  • Erongo Region
    • Karibib District
      • Spitzkopje Area
        • Klein Spitzkopje granite stock (Kleine Spitzkoppe; Klein Spitzkoppe)
http://rruff.geo.arizona.edu/doclib/hom/berndtite.pdf#search=%22berndtite%22
    • Swakopmund District
      • Arandis
No reference
Portugal
 
  • Castelo Branco District
    • Covilhã
Sopa de Pedras, A. M. Galopim de Carvalho, Gradiva, Lisbon
  • Viseu District
    • Vila Nova de Paiva
      • Queiriga
Handbook of Mineralogy
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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