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Benleonardite

Big Photo

Moctezuma Mine (Bambolla Mine), Moctezuma, Mun. de Moctezuma, Sonora, Mexico
© 2005 M. Kampf

Formula:
Ag
 
8
(Sb,As)Te
 
2
S
 
3
System:TetragonalColour:dark grey, black
Lustre:MetallicHardness:3
Name:For Dr. Benjamin Franklin Leonhard (1921-), USGS Denver Colorado
This page provides mineralogical data about Benleonardite.

Classification of Benleonardite

IMA status:Approved 1985
Strunz 8th edition ID:2/B.05-70
Nickel-Strunz 10th (pending) edition ID:2.LA.50

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
Dana 8th edition ID:3.1.10.1

3 : SULFOSALTS
1 : ø > 4
Hey's CIM Ref.:5.2.23

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 Benleonardite

Type Locality:Bambollita Mine (Oriental Mine), Moctezuma, Mun. de Moctezuma, Sonora, Mexico
Place of Conservation of Type Material:British Museum of Natural History
Year of Discovery:1986
Geological Setting of type material:Fractures in an intensely silicified rhyolitic vitrophyre.

Physical Properties of Benleonardite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:dark grey, black
Hardness (Mohs):3
Hardness (Vickers):VHN25=105 - 125 kg/mm2
Density (calculated):7.76 g/cm3

Crystallography of Benleonardite

Crystal System:Tetragonal
Cell Parameters:a = 6.603(5) Å, c = 12.726(5) Å
Ratio:a:c = 1 : 1.927
Unit Cell Volume:V 554.85 ų (Calculated from Unit Cell)
Z:2
Morphology:Crusts and fracture fillings, grains and laths to 60 microns.
Twinning:Some simple law

Optical Data of Benleonardite

Type:Anisotropic
Anisotropism:Moderate to strong in tints of brown, blue and gray
Colour in reflected light:Pale blue

Chemical Properties of Benleonardite

Formula:
Ag
 
8
(Sb,As)Te
 
2
S
 
3
Essential elements:Ag, S, Sb, Te
All elements listed in formula:Ag, As, S, Sb, Te
Common Impurities:Cu

Relationship of Benleonardite to other Species

Common Associates:
AcanthiteHessitePyriteSphaleriteDolomite
Quartz
Related Minerals - Nickel-Strunz Grouping):

- +
2.LA.10Dervillite
Ag
 
2
AsS
 
2
2.LA.15Daomanite
CuPtAsS
 
2
2.LA.20Vaughanite
TlHgSb
 
4
S
 
7
2.LA.25Criddleite
TlAg
 
2
Au
 
3
Sb
 
10
S
 
10
2.LA.30Fettelite
Ag
 
24
HgAs
 
5
S
 
20
2.LA.35Chaméanite
(Cu,Fe)
 
4
As(Se,S)
 
4
2.LA.40Arcubisite
Ag
 
6
CuBiS
 
4
2.LA.45Mgriite
Cu
 
3
AsSe
 
3
2.LA.55Tsnigriite
Ag
 
9
SbTe
 
3
(S,Se)
 
3
2.LA.60Borovskite
Pd
 
3
SbTe
 
4
2.LA.65Jonassonite
AuBi
 
5
S
 
4
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)
5.2.16Aramayoite
Ag(Sb,Bi)S
 
2
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
5.2.24Volynskite
AgBiTe
 
2

Other Names for Benleonardite

Synonyms:
IMA1985-043
Other Languages:
German:Benleonardit
Spanish:Benleonardita

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 Benleonardite

Reference List:American Mineralogist: 73: 439.

Internet Links for Benleonardite

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    Localities for Benleonardite

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