Jalpaite Mineral Data

Jalpaite Mineral Data +

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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.

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),

Physical Properties of Jalpaite

Color:

Gray, Dark gray.

Density:

6.82

Diaphaniety:

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:

r_electron=6.13 gm/cc
note: r_Jalpaite=6.85 gm/cc.

Fermion Index

Fermion Index = 0.00106
Boson Index = 0.99894

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jalpaite is Not Radioactive

Jalpaite Classification

Dana Class:

2.4.4.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.4.4)Dana Group

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

2.4.4.2 IMA2004-048! Ag3CuSe2 I 4₁/amd 4/m 2/m 2/m

Strunz Class:

II/B.06-10 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold

II/B.06 - Jalpaite - Imiterite series

II/B.06-10 Jalpaite Ag3CuS2 I 4₁/amd 4/m 2/m 2/m

II/B.06-20 Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m

II/B.06-30 Stromeyerite AgCuS C mcm 2/m 2/m 2/m

II/B.06-40 Eucairite CuAgSe Pmmn 2/m 2/m 2/m

II/B.06-50 Henryite Cu4Ag3Te4 Unk Cubic

II/B.06-55 Brodtkorbite! Cu2HgSe2 P 2₁/n 2/m

II/B.06-60 Imiterite Ag2HgS2 P 2₁/c 2/m

Other Jalpaite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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

Jalpaite

Ag3CuS2
Dana No: 2.4.4.1 Strunz No: II/B.06-10
Locality:

Notes: