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Jalpaite Mineral Data
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General Jalpaite Information
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 Chemical Formula: |
Ag3CuS2 |
| Composition: |
Molecular Weight = 451.28 gm |
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Copper 14.08 % Cu |
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Silver 71.71 % Ag |
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Sulfur 14.21 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag3CuS2 |
| Environment: |
Formed under low-temperature hydrothermal conditions. |
| IMA Status: |
Valid Species (Pre-IMA) 1858 |
| Locality: |
In the USA, in Colorado, at the Payrock mine in Silver Plume, Clear Creek Co. Link to MinDat.org Location Data. |
| Name Origin: |
For the Mexican locality at Jalpa. |
| Name Pronunciation: |
Jalpaite  |
| Synonym: |
ICSD 67526 |
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PDF 12-207 |
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Jalpaite Image |
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Images:
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Jalpaite Crystallography
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| Axial Ratios: |
a:c = 1:1.36024 |
| Cell Dimensions: |
a = 8.633, c = 11.743, Z = 8; V = 875.19 Den(Calc)= 6.85 |
| Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/amd |
| X Ray Diffraction: |
By Intensity(I/Io): 2.345(1), 2.74(0.9), 2.794(0.9), |
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Physical Properties of Jalpaite
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| Color: |
Gray, Dark gray. |
| Density: |
6.82 |
| Diaphaneity: |
Opaque |
| Fracture: |
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). |
| Hardness: |
2-2.5 - Gypsum-Finger Nail |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Jalpaite
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| RL Anisotrophism: |
Distinct in greenish blues and light green. |
| RL Pleochroism: |
Distinct in oil, brownish gray to pure gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Jalpaite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
34.40 |
35.60 |
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| 420 nm |
34.10 |
36.00 |
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| 440 nm |
33.80 |
36.40 |
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| 460 nm |
33.20 |
36.40 |
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| 480 nm |
32.40 |
35.60 |
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| 500 nm |
31.80 |
34.60 |
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| 520 nm |
31.20 |
33.90 |
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| 540 nm |
30.70 |
33.30 |
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| 560 nm |
30.30 |
32.80 |
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| 580 nm |
29.80 |
32.30 |
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| 600 nm |
29.50 |
31.90 |
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| 620 nm |
29.30 |
31.50 |
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| 640 nm |
29.00 |
31.10 |
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| 660 nm |
28.80 |
30.70 |
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| 680 nm |
28.60 |
30.20 |
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| 700 nm |
28.20 |
29.80 |
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Calculated Relative Intensity Colors of Jalpaite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
300% |
| R1 |
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| R2 |
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Calculated Properties of Jalpaite
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| Electron Density: |
Bulk Density (Electron Density)=6.13 gm/cc
note: Specific Gravity of Jalpaite =6.85 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0010658288
Boson Index = 0.9989341712 |
| Photoelectric: |
PEJalpaite = 190.00 barns/electron
U=PEJalpaite x rElectron Density=1,165.13 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jalpaite is Not Radioactive |
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Jalpaite Classification
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| Dana Class: |
02.04.04.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.04)where Am Bn Xp, with (m+n):p=2:1 |
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(02.04.04)Dana Group |
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02.04.04.01 Jalpaite Ag3CuS2 I 41/amd 4/m 2/m 2/m |
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02.04.04.02 Selenojalpaite! Ag3CuSe2 I 41/amd 4/m 2/m 2/m |
| Strunz Class: |
02.BA.25c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BA -With Cu, Ag, Au |
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02.BA.25c Jalpaite Ag3CuS2 I 41/amd 4/m 2/m 2/m |
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02.BA.25c Selenojalpaite! Ag3CuSe2 I 41/amd 4/m 2/m 2/m |
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Other Jalpaite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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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Print or Cut-and-Paste your Jalpaite Specimen Label here :
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Jalpaite
Ag3CuS2
Dana No: 02.04.04.01 Strunz No: 02.BA.25c
Locality:
Notes:
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