Aramayoite Mineral Data

General Aramayoite Information

Chemical Formula:

Ag3Sb2(Sb,Bi)S6

Composition:

Molecular Weight = 924.87 gm

Silver 34.99 % Ag

Bismuth 11.30 % Bi

Antimony 32.91 % Sb

Sulfur 20.80 % S

______

100.00 %

Empirical Formula:

Ag₃Sb_2.5Bi_0.5S₆

Environment:

In vein-controlled hydrothermal tin and silver ores.

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

In the Animas mine, Chocaya, Sud-Chichas, Potosi, Bolivia. From Herminia, Julcani district; and in the San Genaro mine, Huancavelica, Peru. Link to MinDat.org Location Data.

Name Origin:

Named for Felix Avelino Aramayo, former Managing Director of the Compagnie Aramayo de Mines en Bolivie.

Name Pronunciation:

Aramayoite + Pronunciation

Synonym:

ICSD 8165

PDF 4-696

Aramayoite Image

Images:

Aramayoite Miargyrite

Comments: Aramayoite is present as large thin plates (blue iridescence) to 1mm in massive gray miargyrite matrix.
Location: Julcani Silver mine, Huancavelica Dept., Peru. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Aramayoite Crystallography

Axial Ratios:

a:b:c =0.9449:1:1.074

Cell Dimensions:

a = 7.813, b = 8.268, c = 8.88, Z = 2; alpha = 100.32°, beta = 104.07°, gamma = 90.18° V = 547.42 Den(Calc)= 5.61

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.82(1), 3.22(0.4), 1.94(0.3),

Forms:

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Forms: ( 1 2 2) ( 0 1 0) ( 3 2 0) ( 2 0 1) ( 1 1 0) ( 0 0 1)

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Physical Properties of Aramayoite

Cleavage:

{???} Perfect, {???} Indistinct, {???} Indistinct

Color:

Iron black, Deep blood red.

Density:

5.6

Diaphaneity:

Opaque

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Pseudo Tetragonal - Crystals show a tetragonal shape.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Streak:

black

Optical Properties of Aramayoite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Aramayoite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	38.90	43.40
420 nm	38.85	42.50
440 nm	38.50	41.90
460 nm	38.40	41.60
480 nm	38.20	41.10
500 nm	38.05	40.90
520 nm	37.80	40.50
540 nm	37.50	40.25
560 nm	37.30	40.05
580 nm	37.10	40.10
600 nm	37.00	40.10
620 nm	36.70	39.90
640 nm	36.60	39.50
660 nm	36.20	39.10
680 nm	36.10	39.00
700 nm	36.30	39.80

**Standardized Intensity (100%) Reflection Spectra of Aramayoite in Oil**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	23.60	25.92
420 nm	23.70	26.20
440 nm	23.40	26.10
460 nm	23.00	25.50
480 nm	22.85	25.35
500 nm	22.65	24.80
520 nm	22.40	24.50
540 nm	22.10	24.20
560 nm	21.80	24.00
580 nm	21.50	23.90
600 nm	21.40	23.85
620 nm	21.10	23.60
640 nm	20.85	22.40
660 nm	20.55	22.90
680 nm	20.00	22.30
700 nm	20.20	22.50

**Calculated Relative Intensity Colors of Aramayoite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%
R₁
R₂

**Calculated Relative Intensity Colors of Aramayoite in Oil**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	420%
R₁
R₂

Calculated Properties of Aramayoite

Electron Density:

Bulk Density (Electron Density)=4.93 gm/cc
note: Specific Gravity of Aramayoite =5.62 gm/cc.

Fermion Index:

Fermion Index = 0.0015603069
Boson Index = 0.9984396931

Photoelectric:

PE_Aramayoite= 409.38 barns/electron
U=PE_Aramayoite x rElectron Density=2,019.95 barns/cc.

Radioactivity:

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

Aramayoite Classification

Dana Class:

03.07.04.01 (03)Sulfides - Sulfosalts

(03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.07.04)Dana Group

03.07.04.01 Aramayoite Ag3Sb2(Sb,Bi)S6 P1 1

03.07.04.02 Baumstarkite! Ag3(Sb,As)2SbS6 P1 1

Strunz Class:

02.HA.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HA -With Cu, Ag, Fe (without Pb)

02.HA.25 Aramayoite Ag3Sb2(Sb,Bi)S6 P1 1

02.HA.25 Baumstarkite! Ag3(Sb,As)2SbS6 P1 1

Other Aramayoite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(AmMin, Vol 87, p 753) OPTIC PROP.(AmMin, Vol 87, p 735)

See Also:

Links to other databases for Aramayoite :
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
15 - WWW-MINCRYST

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Aramayoite

Ag3Sb2(Sb,Bi)S6
Dana No: 03.07.04.01 Strunz No: 02.HA.25
Locality:

Notes:

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