Aguilarite Mineral Data

Aguilarite Mineral Data +

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General Aguilarite Information

Chemical Formula:

Ag4SeS

Composition:

Molecular Weight = 542.50 gm

Silver 79.53 % Ag

Selenium 14.55 % Se

Sulfur 5.91 % S

______

100.00 %

Empirical Formula:

Ag₄SeS

Environment:

Low temperature silver mineral in deposits rich in selenium.

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Mexico, Guanajuato, San Carlos mine. Link to MinDat.org Location Data.

Name Origin:

Named for Ponciano Aguilar (1853-1935), superintendent of the San Carlos mine, Guanajuato, where the mineral was found.

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Aguilarite Crystallography

Axial Ratios:

a:b:c =0.6107:1:1.0944

Cell Dimensions:

a = 4.33, b = 7.09, c = 7.76, Z = 2; V = 238.23 Den(Calc)= 7.56

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 2.43(1), 2.88(0.5), 1.48(0.4),

Physical Properties of Aguilarite

Cleavage:

None

Color:

Gray, Iron gray, Black.

Density:

7.4 - 7.56, Average = 7.48

Diaphaniety:

Opaque

Fracture:

Hackly - Jagged, torn surfaces, (e.g. fractured metals).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Non-fluorescent.

Luster:

Adamantine - Metallic

Magnetism:

Nonmagnetic

Streak:

grayish black

Optical Properties of Aguilarite

RL Anisotrophism:

Very weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Aguilarite in Air**
λ	R	∑ R(λ)
400 nm	33.30
420 nm	33.40
440 nm	33.50
460 nm	33.70
480 nm	33.80
500 nm	33.40
520 nm	32.80
540 nm	31.90
560 nm	31.00
580 nm	30.30
600 nm	29.80
620 nm	29.50
640 nm	29.30
660 nm	29.20
680 nm	29.20
700 nm	29.10

**Calculated Relative Intensity Colors of Aguilarite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	290%
R

Calculated Properties of Aguilarite

Electron Density:

r_electron=6.63 gm/cc
note: r_Aguilarite=7.56 gm/cc.

Fermion Index

Fermion Index = 0.0115
Boson Index = 0.9885

Photoelectric:

PE_Aguilarite= 218.58 barns/electron
U=PE_Aguilarite x r_electron=1,449.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aguilarite is Not Radioactive

Aguilarite Classification

Dana Class:

2.4.1.3 (2)Sulfides - Including Selenides and Tellurides

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

(2.4.1)Dana Group

2.4.1.1 Acanthite Ag2S P 2₁/n 2/m

2.4.1.2 Naumannite Ag2Se P 2₁2₁2₁ 2 2 2

2.4.1.3 Aguilarite Ag4SeS P 2₁2₁2₁ 2 2 2

Strunz Class:

II/B.05-50 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.05 - Achantite - Empresite series

II/B.05-02 Argentite* Ag2S I m3m 4/m 3 2/m

II/B.05-10 Acanthite Ag2S P 2₁/n 2/m

II/B.05-30 Naumannite Ag2Se P 2₁2₁2₁ 2 2 2

II/B.05-35 Kurilite* (Ag,Au)2(Te,Se,S) P m3n,P 4₃n Cubic

II/B.05-40 Hessite Ag2Te P 2₁/c 2/m

II/B.05-50 Aguilarite Ag4SeS P 2₁2₁2₁ 2 2 2

II/B.05-60 Cervelleite Ag4TeS Unk Cubic

II/B.05-70 Benleonardite Ag8(Sb,As)Te2S3 Tetra Tetra

II/B.05-75 Tsnigriite Ag9SbTe3(S,Se)3 P 2/m,Pm Mono

II/B.05-80 Stutzite Ag5-xTe3,(x=0.24-0.36) P 6/mmm 6/m 2/m 2/m

II/B.05-90 Empressite AgTe Pmnb 2/m 2/m 2/m

Other Aguilarite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

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

Aguilarite

Ag4SeS
Dana No: 2.4.1.3 Strunz No: II/B.05-50
Locality:

Notes: