Plagionite Mineral Data (original) (raw)
General Plagionite Information
Chemical Formula:
Pb5Sb8S17
Composition:
Molecular Weight = 2,555.12 gm
Antimony 38.12 % Sb
Lead 40.55 % Pb
Sulfur 21.33 % S
______
100.00 %
Empirical Formula:
Pb5Sb8S17
Environment:
Hydrothermal vein deposits.
IMA Status:
Valid Species (Pre-IMA) 1833
Locality:
Wolfsberg, Hartz Mountains. Link to MinDat.org Location Data.
Name Origin:
From the Greek, plagios meaning "oblique."
Name Pronunciation:
Plagionite + Pronunciation 
Synonym:
ICSD 23569
PDF 22-1129
Plagionite Image
Images:
Images:
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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 |
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Plagionite Crystallography
Axial Ratios:
a:b:c =1.1388:1:1.6883
Cell Dimensions:
a = 13.45, b = 11.81, c = 19.94, Z = 4; beta = 107.183° V = 3,025.99 Den(Calc)= 5.61
Crystal System:
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c
X Ray Diffraction:
By Intensity(I/Io): 3.21(1), 2.91(0.9), 3.26(0.9),
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) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Crystal Structure:
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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
Cleavage:
{112} Perfect
Color:
Black, Gray black.
Density:
5.4 - 5.6, Average = 5.5
Diaphaneity:
Opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
2.5 - Finger Nail
Luster:
Metallic
Streak:
reddish gray black
Optical Properties of Plagionite
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
RL Anisotrophism:
Distinct in oil.
RL Color:
White, pale.
RL Pleochroism:
Noticeable.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Plagionite in Air
| λ | R1 | R 2 |  |
∑ R1(λ) | ∑ R2(λ) |
|---|---|---|---|---|---|
| 400 nm | 33.60 | 43.40 |  |
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| 420 nm | 33.80 | 43.50 |  |
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| 440 nm | 34.00 | 43.60 |  |
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| 460 nm | 34.20 | 43.60 |  |
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| 480 nm | 34.30 | 43.50 |  |
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| 500 nm | 34.30 | 43.30 |  |
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| 520 nm | 34.20 | 43.00 |  |
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| 540 nm | 34.00 | 42.50 |  |
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| 560 nm | 33.60 | 41.90 |  |
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| 580 nm | 33.20 | 41.00 |  |
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| 600 nm | 32.70 | 40.20 |  |
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| 620 nm | 32.00 | 39.20 |  |
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| 640 nm | 31.20 | 38.30 |  |
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| 660 nm | 30.30 | 37.40 |  |
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| 680 nm | 29.50 | 36.60 |  |
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| 700 nm | 28.90 | 35.80 |  |
Calculated Relative Intensity Colors of Plagionite in Air
| RelativeIntensity | 0% | 30% | 60% | 90% | 100% | 120% | 150% | 180% | 210% | 240% | 270% | 280% |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| R1 | ||||||||||||
| R2 |
Calculated Properties of Plagionite
Electron Density:
Bulk Density (Electron Density)=4.79 gm/cc
note: Specific Gravity of Plagionite =5.61 gm/cc.
Fermion Index:
Fermion Index = 0.09
Boson Index = 0.91
Photoelectric:
PEPlagionite = 862.20 barns/electron
U=PEPlagionite x rElectron Density=4,126.83 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Plagionite is Not Radioactive
Plagionite Classification
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
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
References:
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
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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Print or Cut-and-Paste your Plagionite Specimen Label here :
Plagionite
Pb5Sb8S17
Dana No: 03.06.20.02 Strunz No: 02.HC.10b
Locality:
Notes: