Plagionite Mineral Data

Plagionite Mineral Data
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General Plagionite Information

Help on Chemical Formula: Chemical Formula: Pb5Sb8S17
Help on Composition: Composition: Molecular Weight = 2,555.12 gm
   Antimony  38.12 %  Sb
   Lead      40.55 %  Pb
   Sulfur    21.33 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb5Sb8S17
Help on Environment: Environment: Hydrothermal vein deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1833
Help on Locality: Locality: Wolfsberg, Hartz Mountains. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, plagios meaning "oblique."
Help on Name Pronunciation: Name Pronunciation: Plagionite + Pronunciation Say PLAGIONITE
Help on Synonym: Synonym: ICSD 23569
  PDF 22-1129
 

Plagionite Image

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Plagionite

Comments: Silvery metallic crystalline plagionite with brassy chalcopyrite.
Location: Rocker Creek, Jefferson County, Montana, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
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Plagionite

Comments: Lead-gray crystals (to 2mm) of plagionite with a bluish tarnish on vuggy white calcite matrix.
Location: Wolfsberg, Harz, Germany. Scale: 3.5 x 2.5 x 1.5cm.
© Tom Loomis / Dakota Matrix

Plagionite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.1388:1:1.6883
Help on Cell Dimensions: Cell Dimensions: a = 13.45, b = 11.81, c = 19.94, Z = 4; beta = 107.183° V = 3,025.99 Den(Calc)= 5.61
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): 3.21(1), 2.91(0.9), 3.26(0.9),
Help on Forms: Forms:

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Forms: ( 0 2 5) ( 0 1 0) ( 0 1 2) ( 1 1 1) ( 1 1 2) ( 1 1 3) ( 0 2 3) ( 1 1 2) ( 1 1 0) ( 1 1 3) ( 0 0 1)

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Cho S A , Wuensch B J , Zeitschrift fur Kristallographie , 139 (1974) p.351-378, The crystal structure of plagionite, Pb5Sb8S17,, the second member in the homologous series Pb3+2nSb8S15+2n, Locality: Wolfsberg, Harz, Germany

 

Physical Properties of Plagionite

Help on Cleavage: Cleavage: {112} Perfect
Help on Color: Color: Black, Gray black.
Help on Density: Density: 5.4 - 5.6, Average = 5.5
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
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: reddish gray black
 

Optical Properties of Plagionite

Help on Optical Data: Optical Data: NCalc= 1.33 - from Gladstone-Dale relationship (KC = 0.0581) where Ncalc=Dcalc*KC+1
NCalc= 1.32 - from Gladstone-Dale relationship (KC = 0.0581) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Distinct in oil.
Help on RL Color: RL Color: White, pale.
Help on RL Pleochroism: RL Pleochroism: Noticeable.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Plagionite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   33.60   43.40 
   
 420 nm   33.80   43.50 
 440 nm   34.00   43.60 
 460 nm   34.20   43.60 
 480 nm   34.30   43.50 
 500 nm   34.30   43.30 
 520 nm   34.20   43.00 
 540 nm   34.00   42.50 
 560 nm   33.60   41.90 
 580 nm   33.20   41.00 
 600 nm   32.70   40.20 
 620 nm   32.00   39.20 
 640 nm   31.20   38.30 
 660 nm   30.30   37.40 
 680 nm   29.50   36.60 
 700 nm   28.90   35.80 
Calculated Relative Intensity Colors of Plagionite in Air
Relative
Intensity		    0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 280%
R1                        
R2                        
 

Calculated Properties of Plagionite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.79 gm/cc
note: Specific Gravity of Plagionite =5.61 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEPlagionite = 862.20 barns/electron
U=PEPlagionite x rElectron Density=4,126.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Plagionite is Not Radioactive
 

Plagionite Classification
Help on Dana Class: Dana Class: 03.06.20.02 (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.10b 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.10b Bismutoplagionite* 5PbS.4Bi2S3 Unk Ortho
 
02.HC.10b Plagionite Pb5Sb8S17 C 2/c 2/m
 

Other Plagionite 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 Plagionite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Plagionite

Pb5Sb8S17
Dana No: 03.06.20.02 Strunz No: 02.HC.10b
Locality:

 

Notes: