Mineralogy Database

Jalpaite Mineral Data

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General Jalpaite Information

Help on Chemical  Formula: Chemical Formula: Ag3CuS2
Help on Composition: Composition: Molecular Weight = 451.28 gm
   Copper  14.08 %  Cu
   Silver  71.71 %  Ag
   Sulfur  14.21 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: Ag3CuS2
Help on Environment: Environment: Formed under low-temperature hydrothermal conditions.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1858
Help on Locality: Locality: In the USA, in Colorado, at the Payrock mine in Silver Plume, Clear Creek Co. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Mexican locality at Jalpa.
Help on Name Pronunciation: Name Pronunciation: Jalpaite Say JALPAITE
Help on Synonym: Synonym: ICSD 67526
  PDF 12-207

Jalpaite Image

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Comments: Tarnished black lustrous masses of jalpaite in rock with blue chrysocolla.
Location: La Mesa, Chihuahua, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Jalpaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.36024
Help on Cell Dimensions: Cell Dimensions: a = 8.633, c = 11.743, Z = 8; V = 875.19 Den(Calc)= 6.85
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): 2.345(1), 2.74(0.9), 2.794(0.9),

Physical Properties of Jalpaite

Help on Color: Color: Gray, Dark gray.
Help on Density: Density: 6.82
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Jalpaite

Help on RL Anisotrophism: RL Anisotrophism: Distinct in greenish blues and light green.
Help on RL Pleochroism: RL Pleochroism: Distinct in oil, brownish gray to pure gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Jalpaite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   34.40   35.60 
 420 nm   34.10   36.00 
 440 nm   33.80   36.40 
 460 nm   33.20   36.40 
 480 nm   32.40   35.60 
 500 nm   31.80   34.60 
 520 nm   31.20   33.90 
 540 nm   30.70   33.30 
 560 nm   30.30   32.80 
 580 nm   29.80   32.30 
 600 nm   29.50   31.90 
 620 nm   29.30   31.50 
 640 nm   29.00   31.10 
 660 nm   28.80   30.70 
 680 nm   28.60   30.20 
 700 nm   28.20   29.80 
Calculated Relative Intensity Colors of Jalpaite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 300%

Calculated Properties of Jalpaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.13 gm/cc
note: Specific Gravity of Jalpaite =6.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0010658288
Boson Index = 0.9989341712
Help on Photoelectric: Photoelectric: PEJalpaite = 190.00 barns/electron
U=PEJalpaite x rElectron Density=1,165.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jalpaite is Not Radioactive

Jalpaite 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 Jalpaite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Jalpaite :
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

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Dana No: Strunz No: 02.BA.25c





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