Mineralogy Database

Kingstonite Mineral Data

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General Kingstonite Information

Help on Chemical  Formula: Chemical Formula: (Rh,Ir,Pt)3S4
Help on Composition: Composition: Molecular Weight = 501.41 gm
   Iridium   16.48 %  Ir
   Platinum  11.28 %  Pt
   Rhodium   46.59 %  Rh
   Sulfur    25.64 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Rh2.27Ir0.43Pt0.29S4.01
Help on Environment: Environment: Discovered in a 1.5 cm nugget, the type specimen of "prassoite." Occurs as inclusions in a Pt-Fe alloy.
Help on IMA Status: IMA Status: Approved IMA 1993 (Dana # Added)
Help on Locality: Locality: Bir Bir river, Yubdo district, Wallaga province, Ethiopia. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Synonym: Synonym: IMA1993-046

Kingstonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9729:1:0.5826
Help on Cell Dimensions: Cell Dimensions: a = 10.4616, b = 10.7527, c = 6.2648, Z = 6; beta = 109° V = 666.34 Den(Calc)= 7.50
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: 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

Physical Properties of Kingstonite

Help on Cleavage: Cleavage: {1kl} Good
Help on Color: Color: Gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Subconchoidal - Brittle frature with subconchoidal fragments
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Kingstonite

Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Bireflectance: RL Bireflectance: Weak.
Help on RL Color: RL Color: Pale brownish gray with no internal reflections.
Help on RL Pleochroism: RL Pleochroism: Weak with dull gray and brown tints.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Kingstonite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   47.20   48.90 
 546 nm   48.40   50.30 
 589 nm   49.10   50.70 
 650 nm   49.80   51.00 
Standardized Intensity (100%) Reflection Spectra of Kingstonite in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   33.20   34.70 
 546 nm   34.30   36.10 
 589 nm   35.00   36.50 
 650 nm   35.60   36.70 
Calculated Relative Intensity Colors of Kingstonite in Air
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180% 190%
Calculated Relative Intensity Colors of Kingstonite in Oil
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270%

Calculated Properties of Kingstonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.64 gm/cc
note: Specific Gravity of Kingstonite =7.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEKingstonite = 500.05 barns/electron
U=PEKingstonite x rElectron Density=3,321.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kingstonite is Not Radioactive

Kingstonite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.10)where Am Bn Xp, with (m+n):p=3:4
  (02.10.02)Wilkmanite Group Wilkmanite Ni3Se4 I2/m 2/m Brezinaite Cr3S4 I2/m 2/m Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m Kingstonite! (Rh,Ir,Pt)3S4 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.DA.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.D - Metal Sulfides, M:S = 3:4 and 2:3
  02.DA -M:S = 3:4
02.DA.25 Kingstonite! (Rh,Ir,Pt)3S4 C 2/m 2/m

Other Kingstonite Information

Help on References: References: NAME( AmMin, v91, p711) PHYS. PROP.(AmMin, v91, p711) OPTIC PROP.(AmMin, v91, p711)
Help on See Also: 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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Dana No: Strunz No: 02.DA.25





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