Wilcoxite Mineral Data

Wilcoxite Mineral Data +

General Wilcoxite Information

Chemical Formula:

MgAl(SO4)2F·18(H2O)

Composition:

Molecular Weight = 586.69 gm

Magnesium 4.14 % Mg 6.87 % MgO

Aluminum 4.60 % Al 8.69 % Al₂O₃

Hydrogen 6.18 % H 55.27 % H₂O

Sulfur 10.93 % S 27.29 % SO₃

Oxygen 70.90 % O

Fluorine 3.24 % F 3.24 % F

- % F -1.36 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgAl(SO₄)₂F·18(H₂O)

Environment:

Post mining product in oxidizable sulfide deposits containing fluorine bearing minerals.

IMA Status:

Approved IMA 1983

Locality:

Lone Pine mine, Catron County, New Mexico. Link to MinDat.org Location Data.

Name Origin:

Named after William Wilcox, who discovered this mining district in 1879. He was killed by Apache Indians in 1880.

Wilcoxite Image

Images:

Wilcoxite

Comments: Small, transparent crystals of wilcoxite.
Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 0.8 mm.
© Thomas Witzke / Abraxas-Verlag

Wilcoxite Crystallography

Axial Ratios:

a:b:c =2.2406:1:1.018

Cell Dimensions:

a = 14.9, b = 6.65, c = 6.77, Z = 1; alpha = 117.433°, beta = 100.583°, gamma = 89.167° V = 585.18 Den(Calc)= 1.66

Crystal System:

TriclinicSpace Group: P 1,P1

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

By Intensity(I/I_o): 4.908(1), 5.654(0.9), 4.371(0.6),

Physical Properties of Wilcoxite

Color:

Colorless, White.

Density:

1.58

Diaphaniety:

Transparent to Translucent

Habit:

Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Water Soluble - Water soluble mineral.

Hardness:

2 - Gypsum

Streak:

white

Optical Properties of Wilcoxite

Gladstone-Dale:

CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2606,KPDmeas= 0.2738,KC= 0.2695

Optical Data:

Biaxial (-), a=1.424, b=1.436, g=1.438, bire=0.0140, 2V(Calc)=44, 2V(Meas)=48. Dispersion not discernible.

Calculated Properties of Wilcoxite

Electron Density:

r_electron=1.67 gm/cc
note: r_Wilcoxite=1.58 gm/cc.

Fermion Index

Fermion Index = 0.00531
Boson Index = 0.99469

Photoelectric:

PE_Wilcoxite= 1.06 barns/electron
U=PE_Wilcoxite x r_electron= 1.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wilcoxite is Not Radioactive

Wilcoxite Classification

Dana Class:

31.9.9.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.9)where (A+ B++) (XO4) Zq·x(H2O)

(31.9.9)Dana Group

31.9.9.1 Wilcoxite MgAl(SO4)2F·18(H2O) P 1,P1 Tri

Strunz Class:

VI/D.07-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.07 - Wilcoxite - Aubertite series

VI/D.07-10 Wilcoxite MgAl(SO4)2F·18(H2O) P 1,P1 Tri

VI/D.07-20 Svyazhinite MgAl(SO4)2F·14(H2O) P1,P 1 Tri

VI/D.07-30 Magnesioaubertite (Mg,Cu)Al(SO4)2Cl·14(H2O) P1 1

VI/D.07-40 Aubertite CuAl(SO4)2Cl·14(H2O) P1 1

Other Wilcoxite Information

References:

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

See Also:

Links to other databases for Wilcoxite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Wilcoxite

MgAl(SO4)2F·18(H2O)
Dana No: 31.9.9.1 Strunz No: VI/D.07-10
Locality:

Notes: