Mineralogy Database

Selenojalpaite Mineral Data

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General Selenojalpaite Information

Help on Chemical  Formula: Chemical Formula: Ag3CuSe2
Help on Composition: Composition: Molecular Weight = 544.63 gm
   Copper    11.78 %  Cu
   Silver    59.22 %  Ag
   Selenium  29.00 %  Se
            100.00 % 
Help on Empirical Formula: Empirical Formula: Ag2.99Cu1.01Se2
Help on Environment: Environment: Selenojalpaite is typically intergrown with eucairite and berzelianite to form aggregates up to several hundred micrometers across in a hydrothermal calcite vein.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Skrikerum Cu-Ag-Tl selenide deposit, Sm´┐Żland, southeastern Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Se analogue of jalpaite.
Help on Synonym: Synonym: IMA2004-048

Selenojalpaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.32498
Help on Cell Dimensions: Cell Dimensions: a = 8.939, c = 11.844, Z = 8; V = 946.40 Den(Calc)= 7.64
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/amd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.426(1)(321), 2.891(0.85)(301), 2.813(0.8)(213),2.473(0.75)(204), 2.162(0.7)(224), 2.034(0.65)(215), 4.47(0.6)(200), 2.552(0.5)(312), 2.292(0.45)(105),

Physical Properties of Selenojalpaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Selenojalpaite

Help on RL Anisotrophism: RL Anisotrophism: Yes with no internal reflections.
Help on RL Bireflectance: RL Bireflectance: Weakly to moderately.
Help on RL Color: RL Color: Light gray.
Help on RL Pleochroism: RL Pleochroism: Weak, brownish gray to greenish gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Selenojalpaite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   33.50   37.10 
 550 nm   31.80   35.10 
 587 nm   30.40   34.00 
 650 nm   29.30   32.40 
Calculated Relative Intensity Colors of Selenojalpaite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 290%

Calculated Properties of Selenojalpaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.67 gm/cc
note: Specific Gravity of Selenojalpaite =7.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESelenojalpaite = 183.50 barns/electron
U=PESelenojalpaite x rElectron Density=1,224.37 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Selenojalpaite is Not Radioactive

Selenojalpaite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.04)Dana Group Jalpaite Ag3CuS2 I 41/amd 4/m 2/m 2/m Selenojalpaite! Ag3CuSe2 I 41/amd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.BA.25c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BA -With Cu, Ag, Au
02.BA.25c Jalpaite Ag3CuS2 I 41/amd 4/m 2/m 2/m
02.BA.25c Selenojalpaite! Ag3CuSe2 I 41/amd 4/m 2/m 2/m

Other Selenojalpaite Information

Help on References: References: NAME( AmMin, v91, p713) PHYS. PROP.(AmMin, v91, p713) OPTIC PROP.(AmMin, v91, p713)
Help on See Also: See Also: Links to other databases for Selenojalpaite :
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.BA.25c





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