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Sanmartinite

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Formula:
(Zn,Fe)WO4
Colour:
Reddish brown; dark brown to brownish black (massive)
Lustre:
Resinous
Hardness:
4 - 4½
Specific Gravity:
6.7
Crystal System:
Monoclinic
Name:
Named after its discovery locality, Los Cerrillos, near San Martín, San Luis, Argentina.
Wolframite Group.
An uncommon secondary mineral resulting from the alteration of scheelite.


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Classification of SanmartiniteHide

Approved, 'Grandfathered' (first described prior to 1959)
4.DB.30

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
48.1.1.3

48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
1 : AXO4

Physical Properties of SanmartiniteHide

Resinous
Transparency:
Translucent
Colour:
Reddish brown; dark brown to brownish black (massive)
Comment:
Dark red internal reflections.
Hardness:
4 - 4½ on Mohs scale
Cleavage:
Perfect
On {010}, perfect.
Density:
6.7 g/cm3 (Measured)    7.87 g/cm3 (Calculated)
Comment:
Calculated density value based on synthetic ZnWO4.

Optical Data of SanmartiniteHide

Type:
Biaxial (+)
Dispersion:
relatively strong

Chemical Properties of SanmartiniteHide

Formula:
(Zn,Fe)WO4
IMA Formula:
ZnWO4
Common Impurities:
Ca,Mn

Crystallography of SanmartiniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 4.702 Å, b = 5.726 Å, c = 4.948 Å
β = 90.3°
Ratio:
a:b:c = 0.821 : 1 : 0.864
Unit Cell V:
133.22 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals rare and minute, only to 60 μm, tabular on {001}, with {001}, {010}, {110}, {112}, and {102}. Commonly in reticulated aggregates and fine-grained massive.

Type Occurrence of SanmartiniteHide

Place of Conservation of Type Material:
The Natural History Museum, London, England: 1978,353. The Academy of Natural Sciences, Philadelphia, USA: #25575. Harvard University, Cambridge, Massachusetts, USA: #134566. U.S. National Museum of Natural History, Washington, D.C., USA: #105681, 137479.
Geological Setting of Type Material:
Quartz vein between granite and granitic pegmatite intruding Precambrian crystalline schists.
Associated Minerals at Type Locality:

Synonyms of SanmartiniteHide

Other Language Names for SanmartiniteHide

Relationship of Sanmartinite to other SpeciesHide

Other Members of this group:
FerberiteFeWO4Mon. 2/m : P2/b
HeftetjerniteScTaO4Mon. 2/m
HuanzalaiteMgWO4Mon. 2/m : P2/b
HübneriteMnWO4Mon. 2/m : P2/b
Rossovskyite(Fe3+,Ta)(Nb,Ti)O4Mon. 2/m : P2/b

Related Minerals - Nickel-Strunz GroupingHide

4.DB.05ArgutiteGeO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05CassiteriteSnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05PlattneritePbO2Tet. 4/mmm (4/m 2/m 2/m)
4.DB.05PyrolusiteMnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05RutileTiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05TripuhyiteFe3+Sb5+O4Tet.
4.DB.05TugarinoviteMoO2Mon.
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb2O6Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
4.DB.10Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10OrdoñeziteZnSb2O6Tet.
4.DB.15bAkhtenskiteε-Mn4+O2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
4.DB.15cNsutite(Mn4+,Mn2+)(O,OH)2Hex.
4.DB.15aParamontroseiteV4+O2Orth.
4.DB.15aRamsdelliteMn4+O2Orth. mmm (2/m 2/m 2/m)
4.DB.20Scrutinyiteα-PbO2Orth.
4.DB.25IshikawaiteU4+Fe2+Nb2O8Mon.
4.DB.25Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8Orth.
4.DB.25Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25SrilankiteZrTi2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
4.DB.25Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8Mon.
4.DB.25Samarskite-(Yb)(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Mon. 2/m : P2/b
4.DB.30FerberiteFeWO4Mon. 2/m : P2/b
4.DB.30HübneriteMnWO4Mon. 2/m : P2/b
4.DB.30KrasnoselskiteCoWO4Mon.
4.DB.30HeftetjerniteScTaO4Mon. 2/m
4.DB.30HuanzalaiteMgWO4Mon. 2/m : P2/b
4.DB.35Columbite-(Fe)FeNb2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Fe)FeTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Mn)MnTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6Orth.
4.DB.35Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10Orth.
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6Orth. mmm (2/m 2/m 2/m)
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8Mon.
4.DB.40LithiotantiteLiTa3O8Mon.
4.DB.40LithiowodginiteLiTa3O8Mon.
4.DB.40TitanowodginiteMn2+TiTa2O8Mon.
4.DB.40WodginiteMn2+Sn4+Ta2O8Mon.
4.DB.40FerrotitanowodginiteFe2+TiTa2O8Mon.
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteV3+TiO3(OH)Mon.
4.DB.50Carmichaelite(Ti,Cr,Fe)[O2-x(OH)x]Mon. 2/m : P21/b
4.DB.55AlumotantiteAlTaO4Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.60Biehlite((Sb,As)O)2[MoO4]Mon.

Related Minerals - Dana Grouping (8th Ed.)Hide

48.1.1.1HübneriteMnWO4Mon. 2/m : P2/b
48.1.1.2FerberiteFeWO4Mon. 2/m : P2/b

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 SanmartiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Angelelli and Gordon (1948) Not. Nat. Academy of Sciences, Philadelphia, no. 205, April, 1948.
American Mineralogist (1948): 33: 653 (abstract).
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1072-1073.
NBS Mono. (1963): 25, 2, 40.
Dunn, P.J. (1978) Sanmartinite: new data. Mineralogical Magazine: 42: 281.
Redfern, S.A.T., A.M.T. Bell, C.M.B. Henderson, and P.F. Schofield (1995) Rietveld study of the structural phase transition in the sanmartinite (ZnWO4)−cuproscheelite (CuWO4) solid solution. European Journal of Mineralogy, 7, 1019–1028.

Internet Links for SanmartiniteHide

Localities for SanmartiniteHide

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.
Argentina
 
  • San Luis
    • Chacabuco department
      • Concarán
Las Especies Minerales De La Republica Argentina, Tomo II, p. 170. Asociacion Mineralogica Argentina
    • San Martín department
      • San Martín
Notulae Naturae Academy of Natural Sciences, Philadelphia (1948) 205, 1-7; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1073.
Canada
 
  • Nova Scotia
    • Inverness Co.
A.K. Chatterjee, "Tungsten Mineralization in the Carbonate Rocks of the George River Group, Cape Breton Island, Nova Scotia", Nova Scotia Dept. Mines, Report 77-7, 1977.
Mexico
 
  • Sonora
    • Mun. de Sahuaripa
Erik Vercammen collection
Mineral and/or Locality  
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