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Parkerite Mineral Data
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General Parkerite Information
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 Chemical Formula: |
Ni3(Bi,Pb)2S2 |
| Composition: |
Molecular Weight = 657.27 gm |
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Nickel 26.79 % Ni |
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Bismuth 47.69 % Bi |
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Lead 15.76 % Pb |
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Sulfur 9.76 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ni3Bi1.5Pb0.5S2 |
| 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  |
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Parkerite Image |
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Images:
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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 |
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Parkerite Crystallography
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| 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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmam |
| X Ray Diffraction: |
By Intensity(I/Io): 2.86(1), 2.34(0.9), 4.02(0.7), |
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Physical Properties of Parkerite
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| 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 |
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Optical Properties of Parkerite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
44.10 |
46.20 |
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| 420 nm |
44.60 |
47.10 |
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| 440 nm |
45.10 |
48.00 |
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| 460 nm |
45.50 |
48.80 |
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| 480 nm |
45.70 |
49.50 |
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| 500 nm |
45.80 |
50.00 |
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| 520 nm |
45.80 |
50.30 |
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| 540 nm |
45.80 |
50.50 |
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| 560 nm |
46.00 |
50.70 |
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| 580 nm |
46.30 |
51.00 |
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| 600 nm |
46.80 |
51.50 |
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| 620 nm |
47.40 |
51.90 |
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| 640 nm |
48.00 |
52.30 |
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| 660 nm |
48.50 |
52.80 |
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| 680 nm |
49.10 |
53.50 |
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| 700 nm |
49.60 |
53.80 |
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Calculated Relative Intensity Colors of Parkerite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
200% |
| R1 |
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| R2 |
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Calculated Properties of Parkerite
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| Electron Density: |
Bulk Density (Electron Density)=7.26 gm/cc
note: Specific Gravity of Parkerite =8.48 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PEParkerite =1,191.19 barns/electron
U=PEParkerite x rElectron Density=8,652.44 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Parkerite is Not Radioactive |
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Parkerite Classification
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| Dana Class: |
02.03.04.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.03)where Am Bn Xp, with (m+n):p=5:2 |
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(02.03.04)Dana Group |
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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 |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BE -With Pb(Bi) |
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02.BE.20 Parkerite Ni3(Bi,Pb)2S2 Pmam 2/m 2/m 2/m |
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Other Parkerite Information
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| 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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Parkerite
Ni3(Bi,Pb)2S2
Dana No: 02.03.04.01 Strunz No: 02.BE.20
Locality:
Notes:
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