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Smithite

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Formula:
AgAsS2
System:
Monoclinic
Colour:
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

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
2.GC.30

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

3 : SULFOSALTS
7 : ø = 2
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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First Recorded Occurrence of Smithite

Year of Discovery:
1905

Physical Properties of Smithite

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:
4.88 g/cm3 (Measured)    

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.

Crystallographic forms of Smithite

Crystal Atlas:
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Smithite - {100}, {101}, {001}, modified
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

Optical Data of Smithite

Type:
Biaxial (-)
Dispersion:
marked to extreme

Chemical Properties of Smithite

Formula:
AgAsS2
Essential elements:
All elements listed in formula:
Common Impurities:
Sb

Relationship of Smithite to other Species

2.GC.05HatchiteAgTlPbAs2S5
2.GC.05Wallisite(Cu,Ag)TlPbAs2S5
2.GC.10SinneriteCu6As4S9
2.GC.15WatanabeiteCu4(As,Sb)2S5
2.GC.20SimoniteTlHgAs3S6
2.GC.25QuadratiteAg(Cd,Pb)AsS3
2.GC.25ManganoquadratiteAgMnAsS3
2.GC.35TrechmanniteAgAsS2
2.GC.40aAleksitePbBi2Te2S2
2.GC.40bKochkaritePbBi4Te7
2.GC.40cPoubaitePbBi2(Se,Te,S)4
2.GC.40cRucklidgeite(Bi,Pb)3Te4
2.GC.40eBabkinitePb2Bi2(S,Se)3
2.GC.40dSaddlebackitePb2Bi2Te2S3
2.GC.45TvalchrelidzeiteHg3SbAsS3
2.GC.50MutnovskitePb4As2S6ICl
5.2.2TrechmanniteAgAsS2
5.2.3ProustiteAg3AsS3
5.2.4XanthoconiteAg3AsS3
5.2.5Pearceite[(Ag,Cu)6(As,Sb)2S7][Ag9CuS4]
5.2.6Pearceite-T2ac
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13
5.2.8MiargyriteAgSbS2
5.2.9PyrargyriteAg3SbS3
5.2.10PyrostilpniteAg3SbS3
5.2.11StephaniteAg5SbS4
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
5.2.13BillingsleyiteAg7AsS6
5.2.14Polybasite-Tac
5.2.15FreibergiteAg6[Cu4Fe2]Sb4S13-x
5.2.16AramayoiteAg(Sb,Bi)S2
5.2.17MatilditeAgBiS2
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4S
5.2.19Pavonite(Ag,Cu)(Bi,Pb)3S5
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2
5.2.22SelenostephaniteAg5Sb(Se,S)4
5.2.23BenleonarditeAg8(Sb,As)Te2S3
5.2.24VolynskiteAgBiTe2

Other Names for Smithite

Other Information

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 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

Localities for Smithite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (La Chapelle-en-Valgaudémar)
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)
Mineral and/or Locality  
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