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Wilcoxite

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Big Photo

Lichtenberg open cast, Ronneburg U deposit, Gera, Thuringia, Germany
© Thomas Witzke

Show Wilcoxite Photos (2)



Formula:
MgAl(SO
 
4
)
 
2
F · 17H
 
2
O
System:TriclinicColour:Colourless, white
Name:Named after William Wilcox.


Aubertite Group.

Soluble in cold water. Will dissolve in its own crystal water if only slightly heated ("Crystals dissolve in their water of crystallisation, if they are illuminated with a hot or bright light source under the microscope.", Williams & Cesbron, 1983).

Classification of Wilcoxite

IMA status:Approved 1979
Strunz 8th edition ID:6/D.07-10
Nickel-Strunz 10th (pending) edition ID:7.DE.45

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
Dana 8th edition ID:31.9.9.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
Hey's CIM Ref.:26.17

26 : Sulphates with Halide
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Type Occurrence of Wilcoxite

Type Locality:Lone Pine Mine, Lone Pine Hill area, Wilcox District, Catron Co., New Mexico, USA
Year of Discovery:1979

Physical Properties of Wilcoxite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless, white

Crystallography of Wilcoxite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 6.644(1) Å, b = 6.749(2) Å, c = 14.892(2) Å
α = 79.664(4)°, β = 80.113(4)°, γ = 62.487(3)°
Ratio:a:b:c = 0.984 : 1 : 2.207
Unit Cell Volume:V 579.6 ų

Optical Data of Wilcoxite

Type:Biaxial (-)
RI values: nα = 1.424 nβ = 1.436 nγ = 1.438
2V:Measured: 48° , Calculated: 44°
Maximum Birefringence:δ = 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:not discernible

Chemical Properties of Wilcoxite

Formula:
MgAl(SO
 
4
)
 
2
F · 17H
 
2
O
Essential elements:Al, F, H, Mg, O, S
All elements listed in formula:Al, F, H, Mg, O, S

Relationship of Wilcoxite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.DE.05Mangazeite
Al
 
2
(SO
 
4
)(OH)
 
4
 · 3H
 
2
O
7.DE.10Carbonatecyanotrichite
Cu
 
4
Al
 
2
(CO
 
3
,SO
 
4
)(OH)
 
12
 · 2H
 
2
O
7.DE.10Cyanotrichite
Cu
 
4
Al
 
2
(SO
 
4
)(OH)
 
12
 · 2H
 
2
O
7.DE.10UKI-1975-(SO:AlCu)
(Cu, Al, SO
 
4
, H
 
2
O)
7.DE.15Schwertmannite
Fe
3+
16
(OH,SO
 
4
)
 
12-13
O
 
16
 · 10-12H
 
2
O
7.DE.20Tlalocite
Cu
 
10
Zn
 
6
(Te
6+
 
O
 
4
)
 
2
(Te
4+
 
O
 
3
)(OH)
 
25
Cl · 27H
 
2
O
7.DE.25Utahite
Cu
 
5
Zn
 
3
(TeO
 
4
)
 
4
(OH)
 
8
 · 7H
 
2
O
7.DE.35Coquandite
(SbO)
 
6
(SO
 
4
)O
 
2
 · H
 
2
O
7.DE.40Osakaite
Zn
 
4
(SO
 
4
)(OH)
 
6
 · 5H
 
2
O
7.DE.50Stanleyite
(V
4+
 
O)(SO
 
4
) · 6H
 
2
O
7.DE.55Mcalpineite
Cu
 
3
(Te
6+
 
O
 
6
) · H
 
2
O
7.DE.60Hydrobasaluminite
Al
 
4
(SO
 
4
)(OH)
 
10
 · 12-36H
 
2
O
7.DE.62Volaschioite
Fe
 
4
(SO
 
4
)O
 
2
(OH)
 
6
 · 2H
 
2
O
7.DE.65Zaherite
Al
 
12
(SO
 
4
)
 
5
(OH)
 
26
 · 20H
 
2
O
7.DE.70Lautenthalite
PbCu
 
4
(SO
 
4
)
 
2
(OH)
 
6
 · 3H
 
2
O
7.DE.75Camerolaite
Cu
 
4
Al
 
2
(HSbO
 
4
,SO
 
4
)(CO
 
3
)(OH)
 
10
 · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
26.1Kogarkoite
Na
 
3
(SO
 
4
)F
26.2Sulphohalite
Na
 
6
(SO
 
4
)
 
2
FCl
26.3Schairerite
Na
 
3
(SO
 
4
)(F,Cl)
26.4Galeite
Na
 
15
(SO
 
4
)
 
5
F
 
4
Cl
26.5Connellite
Cu
 
19
(SO
 
4
)(OH)
 
32
Cl
 
4
 · 3H
 
2
O
26.6Chlorothionite
K
 
2
Cu(SO
 
4
)Cl
 
2
26.7Kamchatkite
KCu
 
3
(SO
 
4
)
 
2
OCl
26.8Spangolite
Cu
 
6
Al(SO
 
4
)(OH)
 
12
Cl · 3H
 
2
O
26.9Aubertite
CuAl(SO
 
4
)
 
2
Cl · 14H
 
2
O
26.10Magnesioaubertite
(Mg,Cu)Al(SO
 
4
)
 
2
Cl · 14H
 
2
O
26.11Svyazhinite
(Mg,Mn
2+
 
,Ca)(Al,Fe
3+
 
)(SO
 
4
)
 
2
F · 14H
 
2
O
26.12D'Ansite
Na
 
21
Mg(SO
 
4
)
 
10
Cl
 
3
26.13Anhydrokainite
KMg(SO
 
4
)Cl
26.14Kainite
KMg(SO
 
4
)Cl · 3H
 
2
O
26.15Mosesite
(Hg
 
2
N)(Cl,SO
 
4
,MoO
 
4
) · H
 
2
O
26.16Kleinite
(Hg
 
2
N)(Cl,SO
 
4
) · nH
 
2
O
26.18Creedite
Ca
 
3
SO
 
4
Al
 
2
F
 
8
(OH)
 
2
 · 2H
 
2
O
26.19Lannonite
HCa
 
4
Mg
 
2
Al
 
4
(SO
 
4
)
 
8
F
 
9
 · 32H
 
2
O
26.20Chukhrovite-(Y)
Ca
 
3
(Y,Ce)[F|SO
 
4
|(AlF
 
6
)
 
2
] · 10H
 
2
O
26.21Chukhrovite-(Ce)
Ca
 
3
(Ce,Y)[F|SO
 
4
|(AlF
 
6
)
 
2
] · 10H
 
2
O
26.22Grandreefite
Pb
 
2
(SO
 
4
)F
 
2
26.23Pseudograndreefite
Pb
 
6
(SO
 
4
)F
 
10
26.24Sundiusite
Pb
 
10
(SO
 
4
)O
 
8
Cl
 
2
26.25Caracolite
Na
 
3
Pb
 
2
(SO
 
4
)
 
3
Cl
26.26Mammothite
Pb
 
6
Cu
 
4
AlSb
5+
 
O
 
2
(OH)
 
16
Cl
 
4
(SO
 
4
)
 
2
26.27Atlasovite
K(BiO)Cu
 
6
Fe
3+
 
(SO
 
4
)
 
5
O
 
3
Cl
26.28Xitieshanite
Fe
3+
 
(SO
 
4
)Cl · 6H
 
2
O
26.29Nabokoite
KCu
 
7
(SO
 
4
)
 
5
(Te
4+
 
O
 
3
)OCl

Other Names for Wilcoxite

Synonyms:
IMA1979-070
Other Languages:
German:Wilcoxit
Spanish:Wilcoxita

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 Wilcoxite

Reference List:

- +
Williams, S. A. & Cesbron, F. P. (1983): Wilcoxite and lannonite, two new fluosulfates from Catron County, New Mexico. Mineral. Mag. 47, 37-40

American Mineralogist (1984): 69: 408.

Peterson, R. C. & Joy, B. R. (2013): Wilcoxite MgAl(SO4)2F•17H2O, from Rico, Colorado: Occurrence and crystal structure. Canadian Mineralogist 51, 107-117.

Internet Links for Wilcoxite

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    • Localities for Wilcoxite

    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.
    Germany
     
    • Thuringia
      • Gera
        • Ronneburg U deposit
    		T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
    Italy
     
    • Piedmont
      • Cuneo Province
        • Gesso Valley
          • Entracque
    		Ciriotti, M. E., Ferrero, S., Blass, G., & Ambrino, P. (2008). Wilcoxite: primo ritrovamento italiano. MICRO (UK report), 2/2008, 75-76.
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
        • Verkhoyansk Fold Belt
          • Verkhoyansk Silver Province
            • Deputatsky ore cluster
    		Zhdanov Yu.Ya., Solov’yev L.I. and Suknev V.S. (1993) Wilcoxite from Yakutia, its second find in the world, - Doklady Rus. Ac. Nauk, 317, p. 136–139 (in Rus.).
    Switzerland
     
    • Wallis (Valais)
      • Martigny
        • Mont Chemin
    		Stalder, H. A., Wagner, A., Graeser, S. und Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf Verlag, Basel, 579 pp.
    USA
     
    • Colorado
      • Dolores Co.
        • Rico District (Pioneer District)
    		Peterson, R. C. & Joy, B. R. (2013): Wilcoxite MgAl(SO4)2F•17H2O, from Rico, Colorado: Occurrence and crystal structure. Canadian Mineralogist 51, 107-117.
    • Michigan
      • Dickinson Co.
        • Menominee iron range
          • Randville
    		Mineralogy of Michigan (E. W. Heinrich & G. W. Robinson)
    • New Mexico
      • Catron Co.
        • Wilcox District
          • Lone Pine Hill area
    		Williams, S. A. & Cesbron, F. P. (1983): Wilcoxite and lannonite, two new fluosulfates from Catron County, New Mexico. Mineral. Mag. 47, 37-40; Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
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