Semseyite Mineral Data

Semseyite Mineral Data
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General Semseyite Information

Help on Chemical Formula: Chemical Formula: Pb9Sb8S21
Help on Composition: Composition: Molecular Weight = 3,512.19 gm
   Antimony  27.73 %  Sb
   Lead      53.10 %  Pb
   Sulfur    19.17 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb9Sb8S21
Help on Environment: Environment: In hydrothermal veins formed at moderate temperature.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1881
Help on Locality: Locality: Felsobanya (Baia Sprie), Rumania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Andor von Semsey (1833-1923), a Hungarian nobleman, who was also an amateur mineralogist.
Help on Name Pronunciation: Name Pronunciation: Semseyite + Pronunciation Say SEMSEYITE
Help on Synonym: Synonym: ICSD 38838
  PDF 22-1130
 

Semseyite Image

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Semseyite

Comments: Crystal clusters of semseyite crystals to 1 cm on sphalerite.
Location: Herja, Romania. Scale: Picture size 5 cm.
© John Veevaert
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Semseyite

Comments: Tabular crystals forming groups and rosettes of gray semseyite with creamy greenish yellow siderite.
Location: Herja mine, Maramures Rumania. Scale: 6.5 x 6 x 3.5 cm.
© Fabre Minerals

Semseyite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.1356:1:2.0623
Help on Cell Dimensions: Cell Dimensions: a = 13.48, b = 11.87, c = 24.48, Z = 4; beta = 105.75° V = 3,769.92 Den(Calc)= 6.19
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.26(1), 2.95(0.9), 3.81(0.9),
Help on Forms: Forms:

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Forms: ( 0 1 0) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Click Here for Large Semseyite Structure Window Crystal Structure:

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Kohatsu J J , Wuensch B J , American Mineralogist , 59 (1974) p.1127-1127, Semseyite (Pb9Sb8S11) and the crystal chemistry of the plagionite group,, Pb3+2nSb8S15+2n, Note: structure from ICSD

 

Physical Properties of Semseyite

Help on Cleavage: Cleavage: {112} Good
Help on Color: Color: Black, Gray.
Help on Density: Density: 5.8 - 6.1, Average = 5.94
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Semseyite

Help on Optical Data: Optical Data: NCalc= 1.47 - from Gladstone-Dale relationship (KC = 0.0761) where Ncalc=Dcalc*KC+1
NCalc= 1.45 - from Gladstone-Dale relationship (KC = 0.0761) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Color: RL Color: White with light green tint.
Help on RL Pleochroism: RL Pleochroism: Very weak, in yellow green to darker, grayish green.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Semseyite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   39.20   47.70 
   
 420 nm   38.30   46.60 
 440 nm   37.40   45.50 
 460 nm   36.90   44.80 
 480 nm   36.50   44.20 
 500 nm   36.30   43.80 
 520 nm   36.10   43.60 
 540 nm   36.00   43.30 
 560 nm   35.80   42.90 
 580 nm   35.30   42.30 
 600 nm   34.80   41.60 
 620 nm   34.10   40.70 
 640 nm   33.40   39.80 
 660 nm   32.50   38.70 
 680 nm   31.50   37.60 
 700 nm   30.50   36.80 
Calculated Relative Intensity Colors of Semseyite in Air
Relative
Intensity		    0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%
R1                      
R2                      
 

Calculated Properties of Semseyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.22 gm/cc
note: Specific Gravity of Semseyite =6.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PESemseyite =1,063.61 barns/electron
U=PESemseyite x rElectron Density=5,556.15 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Semseyite is Not Radioactive
 

Semseyite Classification
Help on Dana Class: Dana Class: 03.06.20.04 (03)Sulfides - Sulfosalts
  (03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.06.20)Fuloppite Group (Monoclinc: C2/c containing Pb, Sb)
 
03.06.20.01 Fuloppite Pb3Sb8S15 C 2/c 2/m
 
03.06.20.02 Plagionite Pb5Sb8S17 C 2/c 2/m
 
03.06.20.03 Heteromorphite Pb7Sb8S19 C 2/c 2/m
 
03.06.20.04 Semseyite Pb9Sb8S21 C 2/c 2/m
 
03.06.20.05 Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m
Help on Strunz Class: Strunz Class: 02.HC.10d 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HC -With only Pb
 
02.HC.10d Semseyite Pb9Sb8S21 C 2/c 2/m
 
02.HC.10d Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m
 

Other Semseyite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Semseyite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Semseyite

Pb9Sb8S21
Dana No: 03.06.20.04 Strunz No: 02.HC.10d
Locality:

 

Notes: