Aguilarite Mineral Data

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.

Name Pronunciation:

Aguilarite + Pronunciation

Aguilarite Image

Images:

Aguilarite

Comments: Black, bladed, metallic aguilarite crystals in matrix.
Location: 4th of July mine, Custer Co., Idaho, USA. Scale: Crystal length 3 mm.
© Tom Loomis / Dakota Matrix

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

Diaphaneity:

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:

Bulk Density (Electron Density)=6.63 gm/cc
note: Specific Gravity of Aguilarite =7.56 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

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

Aguilarite Classification

Dana Class:

02.04.01.03 (02)Sulfides - Including Selenides and Tellurides

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

(02.04.01)Acanthite Group

02.04.01.01 Acanthite Ag2S P 2₁/n 2/m

02.04.01.02 Naumannite Ag2Se P 2₁2₁2₁ 2 2 2

02.04.01.03 Aguilarite Ag4SeS P 2₁2₁2₁ 2 2 2

Strunz Class:

02.BA.30b 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.30b Aguilarite Ag4SeS P 2₁2₁2₁ 2 2 2

02.BA.30b Naumannite Ag2Se P 2₁2₁2₁ 2 2 2

Other Aguilarite Information

References:

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

See Also:

Links to other databases for Aguilarite :
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 Aguilarite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Aguilarite

Ag4SeS
Dana No: 02.04.01.03 Strunz No: 02.BA.30b
Locality:

Notes: