Parkerite Mineral Data

Parkerite Mineral Data +

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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.

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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:

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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

Diaphaniety:

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:

r_electron=7.26 gm/cc
note: r_Parkerite=8.48 gm/cc.

Fermion Index

Fermion Index = 0.03859
Boson Index = 0.96141

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parkerite is Not Radioactive

Parkerite Classification

Dana Class:

2.3.4.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.3.4)Dana Group

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

Strunz Class:

II/B.12-30 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides with predominant Nickel, Cobalt, Rhodium and Palladium

II/B.12 - Rhodplumsite - Oregonite series

II/B.12-10 Rhodplumsite Pb2Rh3S2 R 3m 3 2/m

II/B.12-20 Shandite Pb2Ni3S2 R 3m 3 2/m

II/B.12-25 Laflammeite! Pd3Pb2S2 C 2/m 2/m

II/B.12-30 Parkerite Ni3(Bi,Pb)2S2 Pmam 2/m 2/m 2/m

II/B.12-40 Heazlewoodite Ni3S2 R 32 3 2

II/B.12-50 Oregonite Ni2FeAs2 Unk Hex

Other Parkerite Information

References:

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

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Parkerite

Ni3(Bi,Pb)2S2
Dana No: 2.3.4.1 Strunz No: II/B.12-30
Locality:

Notes: