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Sanmartinite

Formula:
(Zn,Fe)WO
 
4
System:MonoclinicColour:Reddish brown; dark ...
Hardness:4 - 4½
Name:Named after its discovery locality, Los Cerrillos, near San Martín, San Luis, Argentina.


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:
WillemiteTourmaline GroupScheeliteQuartz

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

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.15Akhtenskite
ε-Mn
4+
 
O
 
2
4.DB.15Nsutite
(Mn
4+
 
,Mn
2+
 
)(O,OH)
 
2
4.DB.15Paramontroseite
VO
 
2
4.DB.15Ramsdellite
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.25Iwashiroite-(Y)
Y(Ta,Nb)O
 
4
4.DB.25Samarskite-(Yb)
(Yb,Fe
3+
 
)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.25Písekite-(Y)
4.DB.30Ferberite
FeWO
 
4
4.DB.30Hübnerite
MnWO
 
4
4.DB.30Krasnoselskite
CoWO
 
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.45Tivanite
VTiO
 
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
German names:
SanmartinitZinkwolframit
Russian names:
Санмартинит
Spanish names:
SanmartinitaZinkwolframita

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

    (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.
    Mineral and/or Locality
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