Chrisstanleyite Mineral Data

Chrisstanleyite Mineral Data

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General Chrisstanleyite Information

Chemical Formula:

Ag2Pd3Se4

Composition:

Molecular Weight = 850.84 gm

Silver 25.36 % Ag

Palladium 37.52 % Pd

Selenium 37.12 % Se

______

100.00 %

Empirical Formula:

Ag₂Pd₃Se₄

Environment:

In calcite veins cutting limestones.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Hope's Nose, northern side of Tor Bay, Torquay, Devon, England, United Kingdom. Link to MinDat.org Location Data.

Name Origin:

For Dr. Chris J. Stanley (1954-) of The Natural History Museum in London, in recognition of his contributions to ore mineralogy.

Synonym:

IMA1996-044

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Chrisstanleyite Crystallography

Axial Ratios:

a:b:c =0.6113:1:0.5471

Cell Dimensions:

a = 6.35, b = 10.387, c = 5.683, Z = 2; beta = 114.9° V = 339.99 Den(Calc)= 8.31

Crystal System:

MonoclinicSpace Group: P 2₁/m or P 2₁

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

By Intensity(I/I_o): 1.956(1), 2.742(1), 2.688(0.8),

Crystal Structure:

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Topa D , Makovicky E , Balic-Zunic T , The Canadian Mineralogist , 44 (2006) p.497-505, The crystal structures of jagueite, Cu2Pd3Se4, and chrisstanleyite, Ag2Pd3Se4, Locality: El Chire, La Rioja, Argentina

Physical Properties of Chrisstanleyite

Color:

Gray, Silvery gray.

Density:

8.31

Diaphaniety:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

5 - Apatite

Luster:

Metallic

Streak:

black

Optical Properties of Chrisstanleyite

RL Anisotrophism:

Moderate.

RL Bireflectance:

Weak.

RL Color:

Very light buff to slightly gray-green.

RL Pleochroism:

Slight.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Chrisstanleyite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	39.70	47.20
546 nm	43.10	48.80
589 nm	44.30	49.40
650 nm	44.40	49.20

**Standardized Intensity (100%) Reflection Spectra of Chrisstanleyite in Oil**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	26.20	34.40
546 nm	29.30	35.15
589 nm	30.40	35.55
650 nm	31.00	35.60

**Calculated Relative Intensity Colors of Chrisstanleyite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	230%
R₁
R₂

**Calculated Relative Intensity Colors of Chrisstanleyite in Oil**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	340%
R₁
R₂

Calculated Properties of Chrisstanleyite

Electron Density:

r_electron=7.19 gm/cc
note: r_{Chrisstanleyite}=8.31 gm/cc.

Fermion Index

Fermion Index = 0.112
Boson Index = 0.888

Photoelectric:

PE_{Chrisstanleyite}= 187.69 barns/electron
U=PE_{Chrisstanleyite} x r_electron=1,349.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chrisstanleyite is Not Radioactive

Chrisstanleyite Classification

Dana Class:

2.16.10.2 (2)Sulfides - Including Selenides and Tellurides

(2.16)with miscellaneous formulae

(2.16.10)Chrisstanleyite Group

2.16.10.1 Sopcheite Ag4Pd3Te4 Unk Ortho

2.16.10.2 Chrisstanleyite ! Ag2Pd3Se4 P 2₁/m or P 2₁ Mono

2.16.10.3 Jagueite! Cu2Pd3Se4 P 2₁/c 2/m

Strunz Class:

II/A.06-30 II - Sulfides and sulphosalts

II/A - Alloys and alloylike compounds, with metals of the Platinum series, (Palladium)

II/A.06 - Vasilite - Luberoite series

II/A.06-05 Vasilite (Pd,Cu)16(S,Te)7 I 43m 4 3m

II/A.06-10 Oosterboschite (Pd,Cu)7Se3 Unk Ortho

II/A.06-20 Luberoite Pt5Se4 P 2₁/c 2/m

II/A.06-25 Jagueite! Cu2Pd3Se4 P 2₁/c 2/m

II/A.06-30 Chrisstanleyite Ag2Pd3Se4 P 2₁/m or P 2₁ Mono

II/A.06-40 Tischendorfite! Pd8Hg3Se9 Pmmn, P 2₁mn or Pm21n Ortho

Other Chrisstanleyite Information

References:

NAME( MinRec) PHYS. PROP.(Min.Mag.,Vol.62,p257-264,1998) OPTIC PROP.(MinRec, v 30, p 157)

See Also:

Links to other databases for Chrisstanleyite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Chrisstanleyite Specimen Label here :

Chrisstanleyite

Ag2Pd3Se4
Dana No: 2.16.10.2 Strunz No: II/A.06-30
Locality:

Notes: