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Kingstonite Mineral Data
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General Kingstonite Information
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 Chemical Formula: |
(Rh,Ir,Pt)3S4 |
| Composition: |
Molecular Weight = 501.41 gm |
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Iridium 16.48 % Ir |
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Platinum 11.28 % Pt |
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Rhodium 46.59 % Rh |
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Sulfur 25.64 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Rh2.27Ir0.43Pt0.29S4.01 |
| Environment: |
Discovered in a 1.5 cm nugget, the type specimen of "prassoite." Occurs as inclusions in a Pt-Fe alloy. |
| IMA Status: |
Approved IMA 1993 (Dana # Added) |
| Locality: |
Bir Bir river, Yubdo district, Wallaga province, Ethiopia. Link to MinDat.org Location Data. |
| Name Origin: |
Named in honor of Gordon Andrew Kingston (b. 1939), senior lecturer in the Department of Geology, University of Wales, College of Cardiff, Wales, U.K. |
| Synonym: |
IMA1993-046 |
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Kingstonite Crystallography
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| Axial Ratios: |
a:b:c =0.9729:1:0.5826 |
| Cell Dimensions: |
a = 10.4616, b = 10.7527, c = 6.2648, Z = 6; beta = 109° V = 666.34 Den(Calc)= 7.50 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.156(1)(310 ), 3.081(1)(131), 2.957(0.9)(002 ),
1.791(0.9)(060 ), 1.871(0.8)(441), 1.532(0.7)(062 ), 2.234(0.6)(132), 1.941(0.5)(2
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Physical Properties of Kingstonite
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| Cleavage: |
{1kl} Good |
| Color: |
Gray. |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Subconchoidal - Brittle frature with subconchoidal fragments |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Hardness: |
6 - Orthoclase |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Kingstonite
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| RL Anisotrophism: |
Weak. |
| RL Bireflectance: |
Weak. |
| RL Color: |
Pale brownish gray with no internal reflections. |
| RL Pleochroism: |
Weak with dull gray and brown tints. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Kingstonite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
47.20 |
48.90 |
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| 546 nm |
48.40 |
50.30 |
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| 589 nm |
49.10 |
50.70 |
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| 650 nm |
49.80 |
51.00 |
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Standardized Intensity (100%) Reflection Spectra of Kingstonite in Oil
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
33.20 |
34.70 |
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| 546 nm |
34.30 |
36.10 |
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| 589 nm |
35.00 |
36.50 |
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| 650 nm |
35.60 |
36.70 |
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Calculated Relative Intensity Colors of Kingstonite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
190% |
| R1 |
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| R2 |
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Calculated Relative Intensity Colors of Kingstonite in Oil
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
| R1 |
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| R2 |
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Calculated Properties of Kingstonite
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| Electron Density: |
Bulk Density (Electron Density)=6.64 gm/cc
note: Specific Gravity of Kingstonite =7.50 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PEKingstonite = 500.05 barns/electron
U=PEKingstonite x rElectron Density=3,321.55 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kingstonite is Not Radioactive |
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Kingstonite Classification
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| Dana Class: |
02.10.02.04 (02)Sulfides - Including Selenides and Tellurides |
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(02.10)where Am Bn Xp, with (m+n):p=3:4 |
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(02.10.02)Wilkmanite Group |
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02.10.02.01 Wilkmanite Ni3Se4 I2/m 2/m |
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02.10.02.02 Brezinaite Cr3S4 I2/m 2/m |
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02.10.02.03 Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m |
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02.10.02.04 Kingstonite! (Rh,Ir,Pt)3S4 C 2/m 2/m |
| Strunz Class: |
02.DA.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.D - Metal Sulfides, M:S = 3:4 and 2:3 |
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02.DA -M:S = 3:4 |
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02.DA.25 Kingstonite! (Rh,Ir,Pt)3S4 C 2/m 2/m |
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Other Kingstonite Information
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| References: |
NAME( AmMin, v91, p711) PHYS. PROP.(AmMin, v91, p711) OPTIC PROP.(AmMin, v91, p711) |
| See Also: |
Links to other databases for Kingstonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Kingstonite Specimen Label here :
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Kingstonite
(Rh,Ir,Pt)3S4
Dana No: 02.10.02.04 Strunz No: 02.DA.25
Locality:
Notes:
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