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Smithite

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Formula:
AgAsS
 
2
System:MonoclinicColour:Pale red; red-orange or ...
Hardness:1½ - 2
Name:Named after George Frederick Herbert Smith (1872-1953), crystallographer, British Museum of Natural History, London (England).
This page provides mineralogical data about Smithite.

Classification of Smithite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/E.08-20
Nickel-Strunz 10th (pending) edition ID:2.GC.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
Dana 8th edition ID:3.7.3.1

3 : SULFOSALTS
7 : ø = 2
Hey's CIM Ref.:5.2.1

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 Smithite

Type Locality:Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland
Year of Discovery:1905

Physical Properties of Smithite

Lustre:Adamantine
Diaphaneity (Transparency):Opaque
Colour:Pale red; red-orange or brownish orange on exposure to light
Streak:Vermillion
Hardness (Mohs):1½ - 2
Tenacity:Brittle
Cleavage:Perfect
{100} perfect
Fracture:Conchoidal
Density (measured):4.88 g/cm3

Crystallography of Smithite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 17.23Å, b = 7.78Å, c = 15.19Å
β = 101.2°
Ratio:a:b:c = 2.215 : 1 : 1.952
Unit Cell Volume:V 1,997.43 ų (Calculated from Unit Cell)
Morphology:Equant; tabular {100}. Tabular crystals appear hexagonal due to strong zonal developments nearly 60° apart.
Crystal Atlas:
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Smithite - {100}, {101}, {001}, modified

About Crystal Atlas

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. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Optical Data of Smithite

Type:Biaxial (-)
Dispersion:marked to extreme

Chemical Properties of Smithite

Formula:
AgAsS
 
2
Simplified for copy/paste:AgAsS2
Essential elements:Ag, As, S
All elements listed in formula:Ag, As, S
Common Impurities:Sb

Relationship of Smithite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.GC.05Hatchite
AgTlPbAs
 
2
S
 
5
2.GC.05Wallisite
(Cu,Ag)TlPbAs
 
2
S
 
5
2.GC.10Sinnerite
Cu
 
6
As
 
4
S
 
9
2.GC.15Watanabeite
Cu
 
4
(As,Sb)
 
2
S
 
5
2.GC.20Simonite
TlHgAs
 
3
S
 
6
2.GC.25Quadratite
Ag(Cd,Pb)AsS
 
3
2.GC.25Manganoquadratite
AgMnAsS
 
3
2.GC.35Trechmannite
AgAsS
 
2
2.GC.40aAleksite
PbBi
 
2
Te
 
2
S
 
2
2.GC.40bKochkarite
PbBi
 
4
Te
 
7
2.GC.40cPoubaite
PbBi
 
2
(Se,Te,S)
 
4
2.GC.40cRucklidgeite
(Bi,Pb)
 
3
Te
 
4
2.GC.40eBabkinite
Pb
 
2
Bi
 
2
(S,Se)
 
3
2.GC.40dSaddlebackite
Pb
 
2
Bi
 
2
Te
 
2
S
 
3
2.GC.45Tvalchrelidzeite
Hg
 
3
SbAsS
 
3
2.GC.50Mutnovskite
Pb
 
4
As
 
2
S
 
6
ICl
Related Minerals - Hey's Index Grouping:

- +
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
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
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
 
6
[Cu
 
4
Fe
 
2
]Sb
 
4
S
 
13-x
5.2.16Aramayoite
Ag(Sb,Bi)S
 
2
5.2.17Matildite
AgBiS
 
2
5.2.18Schapbachite
Ag
 
0.4
Pb
 
0.2
Bi
 
0.4
S
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 Smithite

Synonyms:
Arsenomiargyrite (of Jaeger and van Klooster)
Other Languages:
German:Arsenmiargyrit (nach Jaeger und van Klooster)
Smithit
Russian:Смитит
Spanish:Smithita

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 Smithite

Reference List:

- +
Solly (1905) Mineralogical Magazine: 14: 72-82.

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: 430-432.

Geological Society of America Memoir 85 (1962): 142.

Naturwissenschaften (1964): 51: 35.

Internet Links for Smithite

Search Engines:
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  • External Links:
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  • Look for Smithite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Smithite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Find Smithite on www.crystalclassics.co.uk
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  • Localities for Smithite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Atacama Region
      • Copiapó Province
        • Tierra Amarilla
          • Pampa Larga district
            • Alacrán
    maurizio dini
    France
     
    • Provence-Alpes-Côte d'Azur
      • Hautes-Alpes
        • La Chapelle-en-Valgaudemar
    American Mineralogist, Volume 68, pages 235-244, 1983
    Germany
     
    • Baden-Württemberg
      • Wiesloch
    Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Hesse
      • Odenwald
        • Mühltal
          • Nieder-Beerbach
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    Iran
     
    • West Azarbaijan Province (West Azerbaijan Province)
      • Sardasht
    Topa, D., Makovicky, E., Tajedin, H., Putz, H., Zagler, G. (2013): Barikaite, Pb10Ag3(Sb8As11)S19S40, a new member of the sartorite homologous series. Mineralogical Magazine, 77, 3039-3046.
    Ireland
     
    • Co. Tipperary
      • Silvermines District
    Econ Geol (1984) 79:529-548
    Poland
     
    • Podlaskie
      • Suwałki District
        • Suwałki Massif
    Kucha H. 1982: Haycockite and mooihoekite from titanomagnetite ore, Krzemianka, Poland. Mineralogia Polonica, vol. 13, no 2, 27-32.
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Binn
    Cannon, R., Hensel, H. & Raber, T. (2008): Der Reckibach-Dolomit im Binntal, Schweiz: Mineralbestand und Neufunde. Lapis, 33 (3), 20-28; 50. (in German)
        • Fäld (Imfeld; Im Feld; Feld)
    Min.Mag.(1905) 14, 72-82 (p. 74)
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