Plagionite Mineral Data

Plagionite Mineral Data +

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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."

Synonym:

ICSD 23569

PDF 22-1129

Plagionite Image

Images:

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

Images:

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

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

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

By Intensity(I/I_o): 3.21(1), 2.91(0.9), 3.26(0.9),

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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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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

Diaphaniety:

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	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

Electron Density:

r_electron=4.79 gm/cc
note: r_Plagionite=5.61 gm/cc.

Fermion Index

Fermion Index = 0.0912
Boson Index = 0.9088

Photoelectric:

PE_Plagionite= 862.20 barns/electron
U=PE_Plagionite x r_electron=4,126.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Plagionite is Not Radioactive

Plagionite Classification

Dana Class:

3.6.20.2 (3)Sulfides - Sulfosalts

(3.6)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.6.20)Fuloppite Group (Monoclinc: C2/c containing Pb, Sb)

3.6.20.1 Fuloppite Pb3Sb8S15 C 2/c 2/m

3.6.20.2 Plagionite Pb5Sb8S17 C 2/c 2/m

3.6.20.3 Heteromorphite Pb7Sb8S19 C 2/c 2/m

3.6.20.4 Semseyite Pb9Sb8S21 C 2/c 2/m

3.6.20.5 Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m

Strunz Class:

II/E.21-40 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x), Sulfosalts with predominant Iron and Copper x = 2.0

II/E.21 - Rayite - Fülöppite series

II/E.21-10 Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m

II/E.21-20 Semseyite Pb9Sb8S21 C 2/c 2/m

II/E.21-30 Heteromorphite Pb7Sb8S19 C 2/c 2/m

II/E.21-40 Plagionite Pb5Sb8S17 C 2/c 2/m

II/E.21-50 Fuloppite Pb3Sb8S15 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 - HyperPhysics 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Plagionite

Pb5Sb8S17
Dana No: 3.6.20.2 Strunz No: II/E.21-40
Locality:

Notes: