Sanmartinite Mineral Data

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General Sanmartinite Information

Chemical Formula:

(Zn,Fe++)WO4

Composition:

Molecular Weight = 310.85 gm

Zinc 15.78 % Zn 19.64 % ZnO

Iron 4.49 % Fe 5.78 % FeO

Tungsten 59.14 % W 74.58 % WO₃

Oxygen 20.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn_0.75Fe²⁺_0.25(WO₄)

Environment:

Alteration product of scheelite in a quartz vein between granite and granite pegmatite intruding Precambrian crystalline schists.

IMA Status:

Valid Species (Pre-IMA) 1948

Locality:

Los Cerrillos, seven km southwest of San Mart´in, San Luis Province, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Sanmartinite + Pronunciation

Synonym:

ICSD 84540

PDF 15-774

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Sanmartinite Crystallography

Axial Ratios:

a:b:c =0.8193:1:0.8636

Cell Dimensions:

a = 4.68, b = 5.712, c = 4.933, Z = 2; beta = 90.3° V = 131.87 Den(Calc)= 7.83

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.926(1), 1.7(0.6), 2.467(0.5),

Crystal Structure:

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Redfern S A T , Bell A M T , Henderson M B , Schofield P F , European Journal of Mineralogy , 7 (1995) p.1019-1028, Rietveld study of the structural phase transition in the, sanmartinite (ZnWO4)- cuproscheelite (CuWO4) solid solution, Sample: x=0.55

View Additional jPOWD Structure files for Sanmartinite
[1]

Physical Properties of Sanmartinite

Cleavage:

{010} Perfect

Color:

Brownish black, Dark brown.

Density:

6.7

Diaphaneity:

Transparent to Opaque

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Resinous

Streak:

red brown

Optical Properties of Sanmartinite

Gladstone-Dale:

CI meas= -0.114 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1616,KPDmeas= 0.1888,KC= 0.1694
Ncalc = 2.14 - 2.33

Optical Data:

Biaxial (+), b=2.25-2.28

Calculated Properties of Sanmartinite

Electron Density:

Bulk Density (Electron Density)=6.80 gm/cc
note: Specific Gravity of Sanmartinite =7.83 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Sanmartinite= 744.89 barns/electron
U=PE_Sanmartinite x rElectron Density=5,066.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sanmartinite is Not Radioactive

Sanmartinite Classification

Dana Class:

48.01.01.03 (48)Anhydrous Molybdates and Tungstates

(48.01)where A XO4

(48.01.01)Wolframite series

48.01.01.00 Wolframite* (Fe,Mn)WO4 P 2/c 2/m

48.01.01.01 Hubnerite MnWO4 P 2/c 2/m

48.01.01.02 Ferberite FeWO4 P 2/c 2/m

48.01.01.03 Sanmartinite (Zn,Fe)WO4 P 2/c 2/m

48.01.01.04 Heftetjernite! ScTaO4 P 2/c 2/m

Strunz Class:

04.DB.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DB -With medium-sized cations; chains of edge-sharing octahedra

04.DB.30 Ferberite FeWO4 P 2/c 2/m

04.DB.30 Hubnerite MnWO4 P 2/c 2/m

04.DB.30 Krasnoselskite* CoWO4 P 2/c 2/m

04.DB.30 Sanmartinite (Zn,Fe)WO4 P 2/c 2/m

04.DB.30 Wolframoixiolite* (Fe,Mn,Nb)(Nb,W,Ta)O4 Pc m

04.DB.30 Wolframite* (Fe,Mn)WO4 P 2/c 2/m

04.DB.30 Heftetjernite! ScTaO4 P 2/c 2/m

Other Sanmartinite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Sanmartinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Sanmartinite Specimen Label here :

Sanmartinite

(Zn,Fe++)WO4
Dana No: 48.01.01.03 Strunz No: 04.DB.30
Locality:

Notes: