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Anthoinite

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Gifurwe Mines, Gifurwe sector, Cyeru Commune, Northern Province, Rwanda
© 2007, JGW

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Formula:
AlWO
 
3
(OH)
 
3
System:TriclinicColour:White (when free of iron)
Hardness:1
Name:For Raymond Anthoine (1884-?), Belgian mining engineer.
This page provides mineralogical data about Anthoinite.

Classification of Anthoinite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/E.02-50
Nickel-Strunz 10th (pending) edition ID:7.GB.35

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
Dana 8th edition ID:48.3.3.1

48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
3 : Basic Anhydrous Molybdates and Tungstates
Hey's CIM Ref.:27.4.4

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

Type Locality:Mt Misobo Mine, Maniema, Democratic Republic of Congo (Zaïre)
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:
WolframiteScheeliteQuartzFerberiteCassiterite

Occurrences of Anthoinite

Geological Setting:altered skarn (Kara Mine, Tasmania)

Physical Properties of Anthoinite

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

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
Unit Cell Volume:V 848.84 ų (Calculated from Unit Cell)
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:
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
Maximum Birefringence:δ = 0.000

Chart 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:
AlWO
 
3
(OH)
 
3
Essential elements:Al, H, O, W
All elements listed in formula:Al, H, O, W
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:
W
 
1.00
Al
 
0.97
O
 
2.90
(OH)
 
3.10

Relationship of Anthoinite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.GB.05Lindgrenite
Cu
 
3
(MoO
 
4
)
 
2
(OH)
 
2
7.GB.10Szenicsite
Cu
 
3
(MoO
 
4
)(OH)
 
4
7.GB.15Cuprotungstite
Cu
 
2
(WO
 
4
)(OH)
 
2
7.GB.15UM1999-38-WO:CrV
(V, Cr, W, O, H) [V:Cr:W ratio about 2:1:3]
7.GB.20Phyllotungstite
(H
 
2
O,M)
 
x
(W,Fe)(O,OH)
 
3
 · yH
 
2
O (M = Ca, Cs, Pb or K)
7.GB.25Rankachite
Ca
 
0.5
(V
4+
 
,V
5+
 
)(W
6+
 
,Fe
3+
 
)
 
2
O
 
8
(OH) · 2H
 
2
O
7.GB.30Ferrimolybdite
Fe
 
2
(MoO
 
4
)
 
3
 · nH
 
2
O
7.GB.35Mpororoite
Al
 
2
(WO
 
4
)
 
2
O · 6H
 
2
O
7.GB.40Obradovicite
H
 
4
(K,Na)CuFe
 
2
(MoO
 
4
)
 
5
(AsO
 
4
) · 12H
 
2
O
7.GB.45Mendozavilite
Na(Ca,Mg)
 
2
Fe
3+
6
(PMo
 
11
O
 
39
)(PO
 
4
)
 
2
(OH,Cl)
 
10
 · 33H
 
2
O
7.GB.45Paramendozavilite
NaAl
 
4
Fe
3+
7
(PMo
 
12
O
 
40
)(PO
 
4
)
 
5
(OH)
 
16
 · 56H
 
2
O
7.GB.50Tancaite-(Ce)
FeCe(MoO
 
4
)
 
3
·3H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
27.4.1Cuprotungstite
Cu
 
2
(WO
 
4
)(OH)
 
2
27.4.2Scheelite
Ca(WO
 
4
)
27.4.5Mpororoite
Al
 
2
(WO
 
4
)
 
2
O · 6H
 
2
O
27.4.6Yttrotungstite-(Y)
YW
 
2
O
 
6
(OH)
 
3
27.4.7Yttrotungstite-(Ce)
(Ce,Nd,Y)W
 
2
O
 
6
(OH)
 
3
27.4.8Stolzite
Pb(WO
 
4
)
27.4.9Raspite
Pb(WO
 
4
)
27.4.10Russellite
Bi
 
2
WO
 
6
27.4.11Pinalite
Pb
 
3
WO
 
5
Cl
 
2
27.4.12Uranotungstite
(Fe
2+
 
,Ba,Pb)(UO
 
2
)
 
2
(WO
 
4
)(OH)
 
4
 · 12H
 
2
O
27.4.13Hübnerite
MnWO
 
4
27.4.14Ferberite
FeWO
 
4
27.4.15Wolframite
(Fe
2+
 
)WO
 
4
 
 
to (Mn
2+
 
)WO
 
4
27.4.16Ferritungstite
27.4.17Phyllotungstite
(H
 
2
O,M)
 
x
(W,Fe)(O,OH)
 
3
 · yH
 
2
O (M = Ca, Cs, Pb or K)
27.4.18Qitianlingite
(Fe,Mn)
 
2
(Nb,Ta)
 
2
WO
 
10

Other Names for Anthoinite

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 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 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

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    • Localities for Anthoinite

    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.
    Hide Locality List
    (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.
    Australia
     
    • Tasmania
      • Hampshire district
        • Kara Mines
    		Whitehead, 1990; Ralph Bottril 6/10/2005.
    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
    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.
    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
      • 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
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