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Sanmartinite

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Formula:
ZnWO4
System:
Monoclinic
Colour:
Reddish brown; dark ...
Lustre:
Resinous
Hardness:
4 - 4½
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.


Classification of Sanmartinite

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 Sanmartinite

Resinous
Diaphaneity (Transparency):
Translucent
Colour:
Reddish brown; dark brown to brownish black (massive)
Comment:
Dark red internal reflections.
Hardness (Mohs):
4 - 4½
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 Sanmartinite

Type:
Biaxial (+)
Dispersion:
relatively strong

Chemical Properties of Sanmartinite

IMA Formula:
ZnWO4
Elements listed in formula:
Common Impurities:
Ca,Mn

Crystallography of Sanmartinite

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 Volume:
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 Sanmartinite

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:

Relationship of Sanmartinite to other Species

Other Members of Group:
FerberiteFeWO4
HeftetjerniteScTaO4
HuanzalaiteMgWO4
HübneriteMnWO4
Rossovskyite(Fe3+,Ta)(Nb,Ti)O4
4.DB.05ArgutiteGeO2
4.DB.05CassiteriteSnO2
4.DB.05PlattneritePbO2
4.DB.05PyrolusiteMnO2
4.DB.05RutileTiO2
4.DB.05TripuhyiteFe3+Sb5+O4
4.DB.05TugarinoviteMoO2
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb25+O6
4.DB.10Tapiolite-(Fe)Fe2+Ta2O6
4.DB.10Tapiolite-(Mn)Mn2+Ta2O6
4.DB.10OrdoñeziteZnSb25+O6
4.DB.15bAkhtenskiteMnO2
4.DB.15cNsutiteMnx2+Mn4+1-xO2-2x(OH)2x
4.DB.15aParamontroseiteVO2
4.DB.15aRamsdelliteMn4+O2
4.DB.20ScrutinyitePbO2
4.DB.25Ishikawaite(U,Fe,Y)NbO4
4.DB.25Ixiolite(Ta,Mn,Nb)O2
4.DB.25Samarskite-(Y)(Y,Ce,U,Fe,Nb)(Nb,Ta,Ti)O4
4.DB.25SrilankiteTi2ZrO6
4.DB.25Yttrocolumbite-(Y)(Y,U,Fe2+)(Nb,Ta)O4
4.DB.25Calciosamarskite(Ca,Fe,Y)(Nb,Ta,Ti)O4
4.DB.25Samarskite-(Yb)YbNbO4
4.DB.30FerberiteFe2+WO4
4.DB.30HübneriteMn2+WO4
4.DB.30KrasnoselskiteCoWO4
4.DB.30HeftetjerniteScTaO4
4.DB.30HuanzalaiteMgWO4
4.DB.35Columbite-(Fe)Fe2+Nb2O6
4.DB.35Tantalite-(Fe)Fe2+Ta2O6
4.DB.35Columbite-(Mn)Mn2+Nb2O6
4.DB.35Tantalite-(Mn)Mn2+Ta2O6
4.DB.35Columbite-(Mg)MgNb2O6
4.DB.35QitianlingiteFe22+Nb2W6+O10
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)MgTa2O6
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8
4.DB.40LithiotantiteLiTa3O8
4.DB.40LithiowodginiteLiTa3O8
4.DB.40TitanowodginiteMn2+TiTa2O8
4.DB.40WodginiteMn2+Sn4+Ta2O8
4.DB.40FerrotitanowodginiteFe2+TiTa2O8
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteTiV3+O3(OH)
4.DB.50Carmichaelite(Ti,Cr,Fe)(O,OH)2
4.DB.55AlumotantiteAlTaO4
4.DB.60BiehliteSb23+MoO6

Other Names for Sanmartinite

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 Sanmartinite

Reference List:
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 Sanmartinite

mindat.org URL:
https://www.mindat.org/min-3523.html
Please feel free to link to this page.

Localities for Sanmartinite

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.
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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