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Anthoinite

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Formula:
AlWO3(OH)3
System:
Triclinic
Colour:
White (when free of iron)
Hardness:
1
Name:
For Raymond Anthoine (1884-1971), Belgian mining engineer who wrote on prospecting of alluvial deposits.
This page provides mineralogical data about Anthoinite.

Classification of Anthoinite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
7.GB.35

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
48.3.3.1

48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
3 : Basic Anhydrous Molybdates and Tungstates
27.4.4

27 : Sulphites, Chromates, Molybdates and Tungstates
4 : Tungstates
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Type Occurrence of Anthoinite

General Appearance of Type Material:
powdery to chalky masses, and pseudomorphs after large scheelite crystals; as platy crystals to a few mm
Place of Conservation of Type Material:
Royal Museum of Central Africa, Tervuren, Belgium (No. 2.426)
Geological Setting of Type Material:
Sn-W placers, W-bearing quartz veins
Associated Minerals at Type Locality:

Occurrences of Anthoinite

Geological Setting:
altered skarn (Kara Mine, Tasmania)

Physical Properties of Anthoinite

Diaphaneity (Transparency):
Translucent
Colour:
White (when free of iron)
Streak:
White
Hardness (Mohs):
1
Cleavage:
Perfect
On one direction.
Density:
4.78 - 4.87 g/cm3 (Measured)    4.84 g/cm3 (Calculated)

Crystallography of Anthoinite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 8.196(1) Å, b = 9.187(1) Å, c = 11.316(1) Å
α = 92.82(1)°, β = 94.08(1)°, γ = 90.23(1)°
Ratio:
a:b:c = 0.892 : 1 : 1.232
Z:
8
Morphology:
Crystals platy, flattened on {010}. Commonly as powdery or chalky masses and as pseudomorphs after large Scheelite crystals.
X-Ray Powder Diffraction Data:
d-spacingIntensity
5.63 (100)
4.19 (83)
3.058 (71)
3.97 (69)
2.462 (61)
4.33 (37)
4.12 (35)
Comments:
Material from Nyamulilo Mine, Uganda; sample shows preferred orientation

Optical Data of Anthoinite

Type:
Biaxial
RI values:
n = 1.81 - 1.82
Birefringence:
noted under high magnification
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v
Comments:
Measured 2V not determined.

Chemical Properties of Anthoinite

Formula:
AlWO3(OH)3
Essential elements:
All elements listed in formula:
Analytical Data:
Analysis of material from the type locality
WO3 (73.23)
SiO2 (0.73)
Al2O3 (16.41)
Fe2O3 (0.69)
CaO (0.25)
H2O (8.70)

sum 100.01 wt.-%
Empirical Formula:
W1.00Al0.97O2.90(OH)3.10

Relationship of Anthoinite to other Species

7.GB.05LindgreniteCu3(MoO4)2(OH)2
7.GB.10SzenicsiteCu3(MoO4)(OH)4
7.GB.15CuprotungstiteCu2(WO4)(OH)2
7.GB.15UM1999-38-WO:CrV(V, Cr, W, O, H) [V:Cr:W ratio about 2:1:3]
7.GB.20Phyllotungstite(H2O,M)x(W,Fe)(O,OH)3 · yH2O (M = Ca, Cs, Pb or K)
7.GB.25RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2O
7.GB.30FerrimolybditeFe2(MoO4)3 · nH2O
7.GB.35MpororoiteWAlO3(OH)3 · 2(H2O)
7.GB.40Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe33+O34(OH)3]
7.GB.45Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe33+O35(OH)2]
7.GB.45ParamendozaviliteNaAl4Fe7(PO4)5(PMo12O40)(OH)16 · 56H2O
7.GB.50Tancaite-(Ce)FeCe(MoO4)3·3H2O
27.4.1CuprotungstiteCu2(WO4)(OH)2
27.4.2ScheeliteCa(WO4)
27.4.5MpororoiteWAlO3(OH)3 · 2(H2O)
27.4.6Yttrotungstite-(Y)YW2O6(OH)3
27.4.7Yttrotungstite-(Ce)(Ce,Nd,Y)W2O6(OH)3
27.4.8StolzitePb(WO4)
27.4.9RaspitePb(WO4)
27.4.10RusselliteBi2WO6
27.4.11PinalitePb3WO5Cl2
27.4.12Uranotungstite(Fe2+,Ba,Pb)(UO2)2(WO4)(OH)4 · 12H2O
27.4.13HübneriteMnWO4
27.4.14FerberiteFeWO4
27.4.15Wolframite(Fe2+)WO4 to (Mn2+)WO4
27.4.16Ferritungstite
27.4.17Phyllotungstite(H2O,M)x(W,Fe)(O,OH)3 · yH2O (M = Ca, Cs, Pb or K)
27.4.18Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10

Other Names for Anthoinite

Name in Other Languages:
German:Anthoinit
Simplified Chinese:水钨铝矿
Spanish:Anthoinita

Other Information

Other Information:
Slowly attacked by HCl and HNO3; readily soluble in strong KOH solution.

Forms pseudomorphs after Scheelite crystals.
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 Anthoinite

Reference List:
Varlamoff (1947) Société géologique de Belgique, Liége, Bulletin: 70: B153.

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.: 1097-1098.

Niggli, E. and Jäger, E. (1957) Untersuchungen an Anthoinit. Neues Jahrbuch für Mineralogie, Abhandlungen 91, 35-40 (in German).

Sahama, T. G., von Knorring, O. and Lehtinen, M. (1970) New data for anthoinite. Bulletin of the Geological Society of Finland 42, 95-99.

Sahama, T. G. (1981) The secondary tungsten minerals, a review. Mineralogical Record 12, 81-87.

Matsubara, S., Kato, A. and Nagashima, K. (1984) Mpororoite and anthoinite from the Kara mine, Tasmania. Mineralogical Magazine 48, 397-400.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1997) Handbook of Mineralogy, Volume III. Halides, Hydroxides, Oxides. Mineral Data Publishing, Tucson, AZ, 628pp.: 17.

Grey, I. E., Madsen, I. C., Mills, S. J., Hatert, F., Paterson, V. & Bastow, T. J. (2010) A new type of cubic-stacked layer structure in anthoinite, AlWO3(OH)3. American Mineralogist. 95(4), 639–645.

Internet Links for Anthoinite

Localities for Anthoinite

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.
Australia
 
  • Tasmania
    • Hampshire district
      • Kara Mines
Whitehead, 1990; Ralph Bottrill 6/10/2005.; MINERALOGICAL MAGAZINE, SEPTEMBER 1984, VOL. 48, PP. 397-400
Canada
 
  • Yukon Territory
    • Mayo Mining District
      • Mayo
        • Kalzas Mt
J. W. Anthony et al.: Handbook of Mineralogy, Vol. 3 (1997), 17
Democratic Republic of Congo (Zaïre)
 
  • Kivu
J. W. Anthony et al.: Handbook of Mineralogy, Vol. 3 (1997), 17
  • Maniema
Handbook of Mineralogy; http://euromin.w3sites.net/Nouveau_site/gisements/congo/GISCONe.htm
Henri Buttgenbach (1947) Les minéraux de Belgique et du Congo belge
Varlamoff, N (1947): Anthoinite, nouveau tungstate hydraté d'alumine. Annales de la Societé géologique de Belgique, 70, B153-B166; 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: 1098.
Japan
 
  • Honshu Island
    • Kinki Region
      • Kyoto Prefecture
        • Sohraku-gun
          • Wazuka-cho
SHIMOBAYASHI, N., OHNISHI, M., and TSURUTA, K. (2012) Secondary tungsten minerals in quartz veins in the Ishidera area, Wazuka, Kyoto Prefecture, Japan: anthoinite, mpororoite, and Fe-free hydrokenoelsmoreite. Journal of Mineralogical and Petrological Sciences, 107, No. 1 (February), 33-38.
Rwanda
 
  • Kigali City Province
    • Kigali
De Clercq et al., 2008. The tungsten mineralisation at Nyakabingo and Gifurwe (Rwanda): Preliminary results. Geologica Belgica, 11:251-258
  • Northern Province
J. W. Anthony et al.: Handbook of Mineralogy, Vol. 3 (1997), 17; MINERALOGICAL MAGAZINE, SEPTEMBER 1984, VOL. 48, PP. 397-400
    • Burera district
Lapis 16(9), 12 (1991)
    • Cyeru Commune
      • Gifurwe sector
J. W. Anthony et al.: "Handbook of Mineralogy", Vol.3 (1997), 11; Geol. Belg. 11 (2008) 251-258.
Uganda
 
  • Kabale District
J. W. Anthony et al.: Handbook of Mineralogy, Vol. 3, (1997), 17
  • Kigezi District
J. W. Anthony et al.: "Handbook of Mineralogy", Vol.3 (1997), 11
J. W. Anthony et al.: "Handbook of Mineralogy", Vol.3 (1997), 11; MINERALOGICAL MAGAZINE, SEPTEMBER 1984, VOL. 48, PP. 397-400
Mineral and/or Locality  
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