Berndtite Mineral Data

Berndtite Mineral Data +

[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions]
Dan Weinrich Fine Minerals
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows

General Berndtite Information

Chemical Formula:

SnS2

Composition:

Molecular Weight = 182.84 gm

Tin 64.92 % Sn

Sulfur 35.08 % S

______

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.

Berndtite Image

Images:

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

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 ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.78(1), 2.14(0.5), 5.9(0.5),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Hazen R M , Finger L W , American Mineralogist , 63 (1978) p.289-292, The crystal structures and compressibilities of layer minerals at high, pressure. I. SnS2, berndtite, P = 1 atm

View Additional jPOWD Structure files for Berndtite
[1] [2] [3]

Physical Properties of Berndtite

Cleavage:

[0001] Good

Color:

Grayish yellow, Yellow brown.

Density:

4.5

Diaphaniety:

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

Optical Properties of Berndtite

Optical Data:

Uniaxial (-), e=1.705, w=1.93, bire=0.2250.

Calculated Properties of Berndtite

Electron Density:

r_electron=4.05 gm/cc
note: r_Berndtite=4.51 gm/cc.

Fermion Index

Fermion Index = 0.11053
Boson Index = 0.88947

Photoelectric:

PE_Berndtite= 201.35 barns/electron
U=PE_Berndtite x r_electron= 814.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Berndtite is Not Radioactive

Berndtite Classification

Dana Class:

2.12.14.5 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.14)Melonite Group (Trigonal: P3¯m1) AX2 type

2.12.14.1 Melonite NiTe2 P 3m1 3 2/m

2.12.14.2 Kitkaite NiTeSe P 3m1 3 2/m

2.12.14.3 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m

2.12.14.4 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m

2.12.14.5 Berndtite SnS2 P 3m1 3 2/m

2.12.14.6 Shuangfengite IrTe2 P 3m1 3 2/m

2.12.14.7 Sudovikovite! PtSe2 P 3m1 3 2/m

Strunz Class:

II/D.28-10 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.28 - Melonite group, Berntdtite - Moncheite series

II/D.28-10 Berndtite SnS2 P 3m1 3 2/m

II/D.28-20 Kitkaite NiTeSe P 3m1 3 2/m

II/D.28-30 Melonite NiTe2 P 3m1 3 2/m

II/D.28-35 Sudovikovite! PtSe2 P 3m1 3 2/m

II/D.28-40 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m

II/D.28-45 Shuangfengite IrTe2 P 3m1 3 2/m

II/D.28-50 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m

II/D.28-60 Verbeekite! PdSe2 C 2, Cm, or C 2/m Mono

Other Berndtite Information

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

Search for Berndtite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Berndtite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Berndtite Mineral Data :

Ask about Berndtite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Berndtite Specimen Label here :

Berndtite

SnS2
Dana No: 2.12.14.5 Strunz No: II/D.28-10
Locality:

Notes: