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Aramayoite

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Julcani District, Angaraes Province, Huancavelica Department, Peru
© 2005 M. Kampf

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Formula:
Ag(Sb,Bi)S
 
2
System:TriclinicColour:Iron-black; deep red ...
Hardness:2½
Name:Named after Don Felix Avelino Aramayo (1846 - 1929), formerly Managing Director of the Compagnie Aramayo de Mines en Bolivie.
This page provides mineralogical data about Aramayoite.

Classification of Aramayoite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/C.16-20
Nickel-Strunz 10th (pending) edition ID:2.HA.25

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
A : With Cu, Ag, Fe (without Pb)
Dana 8th edition ID:3.7.4.1

3 : SULFOSALTS
7 : ø = 2
Hey's CIM Ref.:5.2.16

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
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Type Occurrence of Aramayoite

Type Locality:Animas Mine, Atocha-Quechisla District, Sud Chichas Province, Potosí Department, Bolivia
Year of Discovery:1926

Occurrences of Aramayoite

Geological Setting:Hydrothermal silver tin ores.

Physical Properties of Aramayoite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Iron-black; deep red (transmitted light)
Streak:Black
Hardness (Mohs):2½
Tenacity:Sectile
Cleavage:Perfect
{010} perfect; {100} fair; {001} poor.
Parting:{101} frequent.
Density (measured):5.602 g/cm3
Density (calculated):5.624 g/cm3

Crystallography of Aramayoite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 7.74Å, b = 8.84Å, c = 8.32Å
α = 100.7°, β = 90°, γ = 103.9°
Ratio:a:b:c = 0.876 : 1 : 0.941
Unit Cell Volume:V 542.40 ų (Calculated from Unit Cell)
Z:6
Morphology:Thin plates
Twinning:About [_101] with composition plane near {_101}
Crystal Atlas:
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Aramayoite - Tabular {010}

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The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. You need Java to see these. You can download Java for free - click here to download Java

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Optical Data of Aramayoite

Type:Anisotropic
Anisotropism:Very high in oil
Colour in reflected light:White
Internal Reflections:Red
Pleochroism:Visible
Comments:Distinct in oil

Chemical Properties of Aramayoite

Formula:
Ag(Sb,Bi)S
 
2
Essential elements:Ag, S, Sb
All elements listed in formula:Ag, Bi, S, Sb
Common Impurities:Cu,Fe

Relationship of Aramayoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.HA.05Chalcostibite
CuSbS
 
2
2.HA.05Emplectite
CuBiS
 
2
2.HA.10Miargyrite
AgSbS
 
2
2.HA.20Berthierite
FeSb
 
2
S
 
4
2.HA.20Garavellite
FeSbBiS
 
4
2.HA.20Clerite
MnSb
 
2
S
 
4
2.HA.25Baumstarkite
AgSbS
 
2
Related Minerals - Hey's Index Grouping:

- +
5.2.1Smithite
AgAsS
 
2
5.2.2Trechmannite
AgAsS
 
2
5.2.3Proustite
Ag
 
3
AsS
 
3
5.2.4Xanthoconite
Ag
 
3
AsS
 
3
5.2.5Pearceite
[(Ag,Cu)
 
6
(As,Sb)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
5.2.6Pearceite-T2ac
5.2.7Argentotennantite
(Ag,Cu)
 
10
(Zn,Fe)
 
2
(As,Sb)
 
4
S
 
13
5.2.8Miargyrite
AgSbS
 
2
5.2.9Pyrargyrite
Ag
 
3
SbS
 
3
5.2.10Pyrostilpnite
Ag
 
3
SbS
 
3
5.2.11Stephanite
Ag
 
5
SbS
 
4
5.2.12Polybasite
[(Ag,Cu)
 
6
(Sb,As)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
5.2.13Billingsleyite
Ag
 
7
AsS
 
6
5.2.14Polybasite-Tac
5.2.15Freibergite
(Ag
 
4+2x
Cu
 
2-2x
)[(Cu, Ag)
 
4
(Fe, Zn)
 
2
]Sb
 
4
S
 
12
S
 
1-x
 (0 < x < 1)
5.2.17Matildite
AgBiS
 
2
5.2.18Schapbachite
AgBiS
 
2
5.2.19Pavonite
(Ag,Cu)(Bi,Pb)
 
3
S
 
5
5.2.20Arcubisite
Ag
 
6
CuBiS
 
4
5.2.21Bohdanowiczite
AgBiSe
 
2
5.2.22Selenostephanite
Ag
 
5
Sb(Se,S)
 
4
5.2.23Benleonardite
Ag
 
8
(Sb,As)Te
 
2
S
 
3
5.2.24Volynskite
AgBiTe
 
2

Other Names for Aramayoite

Other Languages:
German:Aramayoit
Russian:Арамайоит
Spanish:Aramayoita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Aramayoite

Reference List:Spencer (1926), Mineralogical Magazine: 21: 156.

American Mineralogist (1927): 12: 265.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 427-429.

Effenberger, H., Paar, W.H., Topa, D., Criddle, A.J., and Fleck, M. (2002) The new mineal baumstarkite and a structural reinvestigation of aramayoite and miargyrite. American Mineralogist: 87: 753-764.

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    Localities for Aramayoite

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