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Wilcoxite Mineral Data

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General Wilcoxite Information

Help on Chemical  Formula: Chemical Formula: MgAl(SO4)2F•18(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: MgAl(SO4)2F•18(H2O)
Help on Environment: Environment: Post mining product in oxidizable sulfide deposits containing fluorine bearing minerals.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Lone Pine mine, Catron County, New Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after William Wilcox, who discovered this mining district in 1879. He was killed by Apache Indians in 1880.
Help on Name Pronunciation: Name Pronunciation: Wilcoxite + Pronunciation Say WILCOXITE

Wilcoxite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =2.2406:1:1.018
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic Space Group: P 1,P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.908(1), 5.654(0.9), 4.371(0.6),

Physical Properties of Wilcoxite

Help on Color: Color: Colorless, White.
Help on Density: Density: 1.58
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Water Soluble - Water soluble mineral.
Help on Hardness: Hardness: 2 - Gypsum
Help on Streak: Streak: white

Optical Properties of Wilcoxite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2591,KPDmeas= 0.2738,KC= 0.2695
Ncalc = 1.43 - 1.45
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.67 gm/cc
note: Specific Gravity of Wilcoxite =1.58 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0053122098
Boson Index = 0.9946877902
Help on Photoelectric: Photoelectric: PEWilcoxite = 1.06 barns/electron
U=PEWilcoxite x rElectron Density= 1.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wilcoxite is Not Radioactive

Wilcoxite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.09)where (A+ B++) (XO4) Zq�x(H2O)
  (31.09.09)Dana Group Wilcoxite MgAl(SO4)2F•18(H2O) P 1,P1 Tri
Help on  Strunz Class: Strunz Class: 07.DE.45 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DE -With only medium-sized cations; unclassified
07.DE.45 Wilcoxite MgAl(SO4)2F•18(H2O) P 1,P1 Tri

Other Wilcoxite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Wilcoxite :
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

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Dana No: Strunz No: 07.DE.45





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