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Menchettiite

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07021250014949233475684.jpg
Silvio Menchetti
Formula:
AgPb2.40Mn1.60Sb3As2S12
Colour:
Black
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
5.146 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honour of Silvio Menchetti (1937–), Professor of Mineralogy and Crystallography at the University of Florence.
New species belonging to the lillianite series. Chemically related to oyonite.


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Classification of MenchettiiteHide

Approved
Approval Year:
2011

Physical Properties of MenchettiiteHide

Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
2½ - 3 on Mohs scale
Hardness:
VHN100=128 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
5.146 g/cm3 (Calculated)

Optical Data of MenchettiiteHide

Type:
Anisotropic
Anisotropism:
without characteristic rotation tints
Bireflectance:
weakly to moderately bireflectant
Internal Reflections:
none
Pleochroism:
Weak
Comments:
weakly pleochroic from dark gray to a dark green

Chemical Properties of MenchettiiteHide

Formula:
AgPb2.40Mn1.60Sb3As2S12
IMA Formula:
Pb5Mn3Ag2Sb6As4S24

Crystallography of MenchettiiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 19.233(2) Å, b = 12.633(3) Å, c = 8.476(2) Å
β = 90.08(2)°
Ratio:
a:b:c = 1.522 : 1 : 0.671
Unit Cell V:
2059.4 ų
Z:
2
Comment:
Space group P21/n.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.4066 Å(39)
3.4025 Å(39)
3.2853 Å(100)
2.8535 Å(50)
2.8519 Å(47)
2.1190 Å(33)

Type Occurrence of MenchettiiteHide

General Appearance of Type Material:
anhedral to subhedral grains up to 200 µm across
Place of Conservation of Type Material:
Museo di Storia Naturale, Sezione di Mineralogia e Litologia, Università di Firenze, via La Pira 4, I-50121, Firenze, Italy, catalog number 3109/I.
Associated Minerals at Type Locality:

Synonyms of MenchettiiteHide

Relationship of Menchettiite to other SpeciesHide

Other Members of this group:
Andorite IVPb18Ag15Sb47S96Mon. 2 : P2
Andorite VIAgPbSb3S6Orth. mm2 : Pmn21
AndreadiniiteCuHgAg7Pb7Sb24S48Mon. 2/m : P21/b
ArsenquatrandoriteAg17.6Pb12.8Sb38.1As11.5S96Mon. 2/m : P21/b
AschamalmitePb6Bi2S9Mon. 2/m
Clino-oscarkempffiteAg15Pb6Sb21Bi18S72Mon. 2/m : P21/b
ErzwiesiteAg8Pb12Bi16S40Orth. mmm (2/m 2/m 2/m) : Pbcn
EskimoiteAg7Pb10Bi15S36Mon.
FizélyiteAg5Pb14Sb21S48Mon. 2/m
GustaviteAgPbBi3S6Orth. mmm (2/m 2/m 2/m)
HeyrovskýitePb6Bi2S9Orth. mmm (2/m 2/m 2/m) : Cccm
JasrouxiteAg16Pb4(Sb24As16)S72Tric. 1 : P1
LillianitePb3-2xAgxBi2+xS6Orth. mmm (2/m 2/m 2/m)
OscarkempffiteAg10Pb4(Sb17Bi9)S48Orth. mm2
OurayiteAg3Pb4Bi5S13Orth.
OyoniteAg3Mn2Pb4Sb7As4S24Mon. 2/m
RamdohritePb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24Mon. 2/m
RoshchiniteAg19Pb10Sb51S96Orth.
SchirmeritePbAgBi3S6 - Pb3Ag1.5Bi3.5S9Orth.
StaročeskéiteAg0.70Pb1.60(Bi1.35Sb1.35)Σ2.70S6Orth. mmm (2/m 2/m 2/m) : Cmcm
TerrywallaceiteAgPb(Sb,Bi)3S6Mon. 2/m : P21/b
TreasuriteAg7Pb6Bi15S32Mon.
UchucchacuaiteAgMnPb3Sb5S12Orth. mmm (2/m 2/m 2/m) : Pmmm
UstarasitePb(Bi,Sb)6S10 (?)
VikingiteAg5Pb8Bi13S30Mon. 2/m : B2/m
XilingolitePb3Bi2S6Mon.

Other InformationHide

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

References for MenchettiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bindi, L., Keutsch, F.N., Bonazzi, P. (2012): Menchettiite, AgPb2.40Mn1.60Sb3As2S12, a new sulfosalt belonging to the lillianite series from the Uchucchacua polymetallic deposit, Lima Department, Peru. American Mineralogist, 97, 440-446.

Internet Links for MenchettiiteHide

Localities for MenchettiiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Peru (TL)
 
  • Lima
    • Oyon Province
Bindi, L., Keutsch, F.N., Bonazzi, P. (2012): Menchettiite, AgPb2.40Mn1.60Sb3As2S12, a new sulfosalt belonging to the lillianite series from the Uchucchacua polymetallic deposit, Lima Department, Peru. American Mineralogist, 97, 440-446.
 
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