Parkerite Mineral Data

General Parkerite Information

Chemical Formula:

Ni3(Bi,Pb)2S2

Composition:

Molecular Weight = 657.27 gm

Nickel 26.79 % Ni

Bismuth 47.69 % Bi

Lead 15.76 % Pb

Sulfur 9.76 % S

______

100.00 %

Empirical Formula:

Ni₃Bi_1.5Pb_0.5S₂

Environment:

As grains in other hydrothermal sulfide and arsenide minerals.

IMA Status:

Valid Species (Pre-IMA) 1937

Locality:

Waterfall Gorge, Insizwa, Griqualand, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Robert Luling Parker (1893-1973), Zurich, Switzerland.

Name Pronunciation:

Parkerite + Pronunciation

Parkerite Image

Images:

Parkerite Talnakhite

Comments: Cut, not polished section showing rounded grains of parkerite (yellow arrow) in 'dactiloscopyc' galena aggregate in talnakhite-chalcopyrite ore. Talnakhite is bronze-violet slightly oxidised grain streaked with golden chalcopyrite.
Location: Taimyr (Oktyabr'skoye; Oktyabr'sky) Cu-Ni deposit, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia. Scale: Picture Size 4x3 mm.
© Pavel M. Kartashov

Parkerite Crystallography

Axial Ratios:

a:b:c =0.9675:1:0.707

Cell Dimensions:

a = 5.545, b = 5.731, c = 4.052, Z = 1; V = 128.77 Den(Calc)= 8.48

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmam

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

By Intensity(I/I_o): 2.86(1), 2.34(0.9), 4.02(0.7),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Fleet M E , American Mineralogist , 58 (1973) p.435-439, The crystal structure of parkerite (Ni3Bi2S2)

Physical Properties of Parkerite

Cleavage:

{010} Perfect, {111} Parting

Color:

Bronze brown, Bronze.

Density:

8.5

Diaphaneity:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3 - Calcite

Luster:

Metallic

Streak:

metallic

Optical Properties of Parkerite

RL Anisotrophism:

Strong, greenish gray to yellowish brown.

RL Color:

Light cream.

RL Pleochroism:

Perceptible.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Parkerite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	44.10	46.20
420 nm	44.60	47.10
440 nm	45.10	48.00
460 nm	45.50	48.80
480 nm	45.70	49.50
500 nm	45.80	50.00
520 nm	45.80	50.30
540 nm	45.80	50.50
560 nm	46.00	50.70
580 nm	46.30	51.00
600 nm	46.80	51.50
620 nm	47.40	51.90
640 nm	48.00	52.30
660 nm	48.50	52.80
680 nm	49.10	53.50
700 nm	49.60	53.80

**Calculated Relative Intensity Colors of Parkerite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R₁
R₂

Calculated Properties of Parkerite

Electron Density:

Bulk Density (Electron Density)=7.26 gm/cc
note: Specific Gravity of Parkerite =8.48 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Parkerite=1,191.19 barns/electron
U=PE_Parkerite x rElectron Density=8,652.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Parkerite is Not Radioactive

Parkerite Classification

Dana Class:

02.03.04.01 (02)Sulfides - Including Selenides and Tellurides

(02.03)where Am Bn Xp, with (m+n):p=5:2

(02.03.04)Dana Group

02.03.04.01 Parkerite Ni3(Bi,Pb)2S2 Pmam 2/m 2/m 2/m

Strunz Class:

02.BE.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)

02.BE -With Pb(Bi)

02.BE.20 Parkerite Ni3(Bi,Pb)2S2 Pmam 2/m 2/m 2/m

Other Parkerite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Parkerite :
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 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Parkerite 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 Parkerite Specimen Label here :

Parkerite

Ni3(Bi,Pb)2S2
Dana No: 02.03.04.01 Strunz No: 02.BE.20
Locality:

Notes: