Mineralogy Database

Wiluite Mineral Data

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General Wiluite Information

Help on Chemical  Formula: Chemical Formula: Ca19(Al,Mg,Fe,Ti)13(B,Al,[ ])5Si18O68(O,OH)10
Help on Composition: Composition: Molecular Weight = 2,924.83 gm
   Calcium    26.04 %  Ca   36.43 % CaO
   Magnesium   3.99 %  Mg    6.61 % MgO
   Titanium    0.82 %  Ti    1.37 % TiO2
   Aluminum    6.46 %  Al   12.20 % Al2O3
   Iron        1.72 %  Fe    2.46 % Fe2O3
   Silicon    17.28 %  Si   36.98 % SiO2
   Boron       0.96 %  B     3.09 % B2O3
   Hydrogen    0.07 %  H     0.62 % H2O
   Oxygen     42.67 %  O
             ______        ______ 
             100.00 %       99.75 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca19Al7Mg4.8Fe3+0.9Ti0.5B2.6Si18O76(OH)2
Help on Environment: Environment: Found with grossular and serpentine-group minerals in a serpentinized skarn. Isostructural with vesuvianite.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Wilui River, Yakutia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the discovery locality.
Help on Name Pronunciation: Name Pronunciation: Wiluite Say WILUITE
Help on Synonym: Synonym: IMA1997-026

Wiluite Image

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Comments: Dark green, blocky wiluite crystal.
Location: Wilui River Region, Russia. Scale: 1-1/8" x 1"..
© Chris Wright / Wrights Rock Shop

Wiluite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.74384
Help on Cell Dimensions: Cell Dimensions: a = 15.752, c = 11.717, Z = 2; V = 2,907.29 Den(Calc)= 3.34
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/nnc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.776(1), 2.617(0.61), 2.491(0.61),2.592(0.43), 1.66(0.26), 1.64(0.23), 2.121(0.2), 3.52(0.18), 1.987(0.15),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 0) ( 1 0 1) ( 0 0 1) ( 1 0 0)

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Physical Properties of Wiluite

Help on Cleavage: Cleavage: {100} Poor
Help on Color: Color: Dark green.
Help on Density: Density: 3.36
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: colorless

Optical Properties of Wiluite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2165,KPDmeas= 0.2152,KC= 0.2138
Ncalc = 1.71 - 1.72
Help on Optical Data: Optical Data: Uniaxial (+), w=1.721, e=1.725, bire=0.0040.

Calculated Properties of Wiluite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Wiluite =3.36 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEWiluite = 4.79 barns/electron
U=PEWiluite x rElectron Density= 16.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wiluite is Not Radioactive

Wiluite Classification

Help on  Dana Class: Dana Class: (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.02.04)Vesuvianite Group Vesuvianite Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 P 4/n 4/m Wiluite! Ca19(Al,Mg,Fe,Ti)13(B,Al,[])5Si18O68(O,OH)10 P 4/nnc 4/m 2/m 2/m Fluorvesuvianite! Ca19(Al,Mg)13[SiO4]10[Si2O7]4(F,OH)10 P 4/nnc 4/m 2/m 2/m Manganvesuvianite! Ca19Mn(Al,Mn,Fe)10(Mg,Mn)2Si18O69(OH)9 P 4/n 4/m
Help on  Strunz Class: Strunz Class: 09.BG.35 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
09.BG.35 Vesuvianite Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 P 4/n 4/m
09.BG.35 Fluorvesuvianite! Ca19(Al,Mg)13[SiO4]10[Si2O7]4(F,OH)10 P 4/nnc 4/m 2/m 2/m
09.BG.35 Wiluite! Ca19(Al,Mg,Fe,Ti)13(B,Al,[])5Si18O68(O,OH)10 P 4/nnc 4/m 2/m 2/m
09.BG.35 Manganvesuvianite! Ca19Mn(Al,Mn,Fe)10(Mg,Mn)2Si18O69(OH)9 P 4/n 4/m

Other Wiluite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(CanMin, 10/98) OPTIC PROP.(CanMin, 10/98)
Help on See Also: See Also: Links to other databases for Wiluite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - HyperPhysics
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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


Ca19(Al,Mg,Fe,Ti)13(B,Al,[ ])5Si18O68(O,OH)10
Dana No: Strunz No: 09.BG.35





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