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Sanmartinite

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Formula:
(Zn,Fe)WO
 
4
System:MonoclinicColour:Reddish brown; dark ...
Hardness:4 - 4½
Member of:Wolframite Group
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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/D.16-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:48.1.1.3

48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
1 : AXO4
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Type Occurrence of Sanmartinite

Type Locality:Los Cerillos, San Martin, Los Corrillos, San Luis, Argentina
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.
Year of Discovery:1948
Geological Setting of type material:Quartz vein between granite and granitic pegmatite intruding Precambrian crystalline schists.
Associated Minerals at type locality:
WillemiteTourmalineScheeliteQuartz

Physical Properties of Sanmartinite

Lustre: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 (measured):6.7 g/cm3
Density (calculated):7.87 g/cm3
Comment:Calculated density value based on synthetic ZnWO4.

Crystallography of Sanmartinite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Cell Parameters:a = 4.702Å, b = 5.726Å, c = 4.948Å
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.

Optical Data of Sanmartinite

Type:Biaxial (+)
Dispersion:relatively strong

Chemical Properties of Sanmartinite

Formula:
(Zn,Fe)WO
 
4
Essential elements:O, W, Zn
All elements listed in formula:Fe, O, W, Zn
Common Impurities:Ca,Mn

Relationship of Sanmartinite to other Species

Member of:Wolframite Group
Other Members of Group:

- +
Ferberite
FeWO
 
4
Heftetjernite
ScTaO
 
4
Huanzalaite
MgWO
 
4
Hübnerite
MnWO
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
4.DB.05Argutite
GeO
 
2
4.DB.05Cassiterite
SnO
 
2
4.DB.05Plattnerite
PbO
 
2
4.DB.05Pyrolusite
MnO
 
2
4.DB.05Rutile
TiO
 
2
4.DB.05Tripuhyite
Fe
3+
 
Sb
5+
 
O
 
4
4.DB.05Tugarinovite
MoO
 
2
4.DB.05Varlamoffite
(Sn,Fe)(O,OH)
 
2
4.DB.10Byströmite
MgSb
 
2
O
 
6
4.DB.10Tapiolite-(Fe)
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
4.DB.10Tapiolite-(Mn)
(Mn,Fe)(Ta,Nb)
 
2
O
 
6
4.DB.10Ordoñezite
ZnSb
 
2
O
 
6
4.DB.15bAkhtenskite
ε-Mn
4+
 
O
 
2
4.DB.15cNsutite
(Mn
4+
 
,Mn
2+
 
)(O,OH)
 
2
4.DB.15aParamontroseite
V
4+
 
O
 
2
4.DB.15aRamsdellite
Mn
4+
 
O
 
2
4.DB.20Scrutinyite
alpha-PbO
 
2
4.DB.25Ishikawaite
U
4+
 
Fe
2+
 
Nb
 
2
O
 
8
4.DB.25Ixiolite
(Ta,Nb,Sn,Fe,Mn)
 
4
O
 
8
4.DB.25Samarskite-(Y)
(Y,Fe
3+
 
,Fe
2+
 
,U,Th,Ca)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.25Srilankite
Ti
 
2
ZrO
 
6
4.DB.25Yttrocolumbite-(Y)
Y(U
4+
 
,Fe
2+
 
)Nb
 
2
O
 
8
4.DB.25Calciosamarskite
(Ca,Fe
3+
 
,Y)
 
2
(Nb,Ta,Ti)
 
2
O
 
8
4.DB.25Samarskite-(Yb)
(Yb,Fe
3+
 
)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.30Ferberite
FeWO
 
4
4.DB.30Hübnerite
MnWO
 
4
4.DB.30Krasnoselskite
CoWO
 
4
4.DB.30Heftetjernite
ScTaO
 
4
4.DB.30Huanzalaite
MgWO
 
4
4.DB.35Columbite-(Fe)
FeNb
 
2
O
 
6
4.DB.35Tantalite-(Fe)
FeTa
 
2
O
 
6
4.DB.35Columbite-(Mn)
(Mn,Fe)(Nb,Ta)
 
2
O
 
6
4.DB.35Tantalite-(Mn)
MnTa
 
2
O
 
6
4.DB.35Columbite-(Mg)
(Mg,Fe,Mn)(Nb,Ta)
 
2
O
 
6
4.DB.35Qitianlingite
(Fe,Mn)
 
2
(Nb,Ta)
 
2
WO
 
10
4.DB.35Magnocolumbite
4.DB.35Tantalite-(Mg)
(Mg,Fe
2+
 
)(Ta,Nb)
 
2
O
 
6
4.DB.40Ferrowodginite
FeSnTa
 
2
O
 
8
4.DB.40Lithiotantite
Li(Ta,Nb)
 
3
O
 
8
4.DB.40Lithiowodginite
LiTa
 
3
O
 
8
4.DB.40Titanowodginite
MnTiTa
 
2
O
 
8
4.DB.40Wodginite
Mn(Sn,Ta)Ta
 
2
O
 
8
4.DB.40Ferrotitanowodginite
Fe
2+
 
TiTa
 
2
O
 
8
4.DB.40Wolframowodginite
Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)
 
2
O
 
8
4.DB.45Tivanite
V
3+
 
TiO
 
3
(OH)
4.DB.50Carmichaelite
(Ti,Cr,Fe)[O
 
2-x
(OH)
 
x
]
4.DB.55Alumotantite
AlTaO
 
4
4.DB.60Biehlite
((Sb,As)O)
 
2
[MoO
 
4
]

Other Names for Sanmartinite

Synonyms:
Zinkwolframite
Other Languages:
German:Sanmartinit
Zinkwolframit
Russian:Санмартинит
Spanish:Sanmartinita
Zinkwolframita

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 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

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    • Localities for Sanmartinite

    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.
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    (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.
    Argentina
     
    • San Luis
      • Concarán
    		Las Especies Minerales De La Republica Argentina, Tomo II, p. 170. Asociacion Mineralogica Argentina
      • Los Corrillos
        • San Martin
    		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.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 18th Jun 2011 14:28:16
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