Jalpaite Mineral Data

General Jalpaite Information

Chemical Formula:

Ag3CuS2

Composition:

Molecular Weight = 451.28 gm

Copper 14.08 % Cu

Silver 71.71 % Ag

Sulfur 14.21 % S

______

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

PDF 12-207

Jalpaite Image

Images:

Jalpaite

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

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 DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

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

By Intensity(I/I_o): 2.345(1), 2.74(0.9), 2.794(0.9),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Baker C L , Lincoln F J , Johnson W S , Australian Journal of Chemistry , 45 (1992) p.1441-1449, Crystal structure determination of Ag3CuS2 from powder X-ray diffraction data, Locality: synthetic

Physical Properties of Jalpaite

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

Optical Properties of Jalpaite

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	∑ 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**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	300%
R₁
R₂

Calculated Properties of Jalpaite

Electron Density:

Bulk Density (Electron Density)=6.13 gm/cc
note: Specific Gravity of Jalpaite =6.85 gm/cc.

Fermion Index:

Fermion Index = 0.0010658288
Boson Index = 0.9989341712

Photoelectric:

PE_Jalpaite= 190.00 barns/electron
U=PE_Jalpaite x rElectron Density=1,165.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jalpaite is Not Radioactive

Jalpaite Classification

Dana Class:

02.04.04.01 (02)Sulfides - Including Selenides and Tellurides

(02.04)where Am Bn Xp, with (m+n):p=2:1

(02.04.04)Dana Group

02.04.04.01 Jalpaite Ag3CuS2 I 4₁/amd 4/m 2/m 2/m

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

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

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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Ask about Jalpaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Jalpaite Specimen Label here :

Jalpaite

Ag3CuS2
Dana No: 02.04.04.01 Strunz No: 02.BA.25c
Locality:

Notes: